Document And Entity Information
Expected dividend rate
Note To Financial Statement Details Textual
Derivative, Notional Amount
Significant Accounting Policies
Note 1 - Nature of Business and Summary of Significant Accounting Policies
Computed income tax expense (benefit) at federal statutory rates
Note 2 - Revenue Recognition
Risk-free interest rate
Note 3 - Segment Reporting
Note 4 - Goodwill and Intangible Assets
Note 5 - Selected Financial Statement Data
Note 9 - Leases
Long-term Purchase Commitment [Table Text Block]
Note 10 - Shareholders' Equity and Share-Based Compensation
Note 12 - Income Taxes
Unrealized gain (loss) on available-for-sale securities, net of tax
Income Tax Disclosure [Text Block]
Note 13 - Cash Flow Information
Note 14 - Fair Value Measurement
Note 15 - Derivative Financial Instruments
Note 16 - Commitments and Contingencies
Acquisition-related contingency consideration
Expected volatility
Current liabilities
us-gaap_LiabilitiesCurrent
Total current liabilities
Note 1 - Nature of Business and Summary of Significant Accounting Policies - Equity Method Investments (Details)
us-gaap_DueToRelatedPartiesCurrent
Due to Related Parties, Current, Total
Note 1 - Nature of Business and Summary of Significant Accounting Policies - Cash, Cash Equivalents, and Restricted Cash (Details)
Note 1 - Nature of Business and Summary of Significant Accounting Policies - Estimated Useful Lives (Details)
Note 1 - Nature of Business and Summary of Significant Accounting Policies - Earnings (Loss) Per Share (Details)
Expected life of option (in years) (Year)
Note 1 - Nature of Business and Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details)
Note 2 - Revenue Recognition - Disaggregation of Revenue (Details)
Note 2 - Revenue Recognition - Contract Assets and Liabilities (Details)
Note 3 - Segment Reporting - Segment Reporting Information (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value
Note 3 - Segment Reporting - Net Sales and Property and Equipment (Details)
Note 4 - Goodwill and Intangible Assets - Goodwill (Details)
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Note 4 - Goodwill and Intangible Assets - Intangible Assets, Net (Details)
us-gaap_LitigationReserveCurrent
Estimated Litigation Liability, Current
Note 4 - Goodwill and Intangible Assets - Amortization Expenses (Details)
Note 5 - Selected Financial Statement Data - Inventories (Details)
Note 5 - Selected Financial Statement Data - Property and Equipment, Net (Details)
Note 5 - Selected Financial Statement Data - Accrued Expenses (Details)
Share-based Payment Arrangement, Option, Activity [Table Text Block]
Note 5 - Selected Financial Statement Data - Other (Expense) Income (Details)
Note 9 - Leases - Cash Flow Information Related to Lease Liabilities (Details)
Note 9 - Leases - Future Minimum Operating Lease Payments (Details)
Granted, Weighted Average Grant Date Fair Value (in dollars per share)
Proceeds from sales or maturities of marketable securities
Note 10 - Shareholders' Equity and Share-Based Compensation - Nonvested Restricted Stock and Restricted Stock Units (Details)
Vested, Weighted Average Grant Date Fair Value (in dollars per share)
Note 10 - Shareholders' Equity and Share-Based Compensation -Stock Option (Details)
Forfeited, Weighted Average Grant Date Fair Value (in dollars per share)
dakt_CommonShareRightsExercisePeriodOptionOne
Common Share Rights Exercise, Period, Option One (Day)
Represents period of option one for common shares exercise period.
Note 10 - Shareholders' Equity and Share-Based Compensation -Weighted-average Fair Value of Options Granted (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Outstanding, Weighted Average Grant Date Fair Value (in dollars per share)
Outstanding, Weighted Average Grant Date Fair Value (in dollars per share)
Note 10 - Shareholders' Equity and Share-Based Compensation - Summary of Share-based Compensation (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Forfeited, number of nonvested shares (in shares)
Note 12 - Income Taxes - Pretax Income Attribute to Domestic and Foreign Operations (Details)
Cumulative translation adjustments
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Outstanding at beginning of year, number of nonvested shares (in shares)
Outstanding at end of year (in shares)
Note 12 - Income Taxes - Income Tax (Benefit) Expense (Details)
Note 12 - Income Taxes - Effective Income Tax (Details)
Note 12 - Income Taxes - Components of Net Deferred Tax Assets (Details)
Note 12 - Income Taxes - Unrecognized Uncertain Tax Benefits (Details)
Granted, number of nonvested shares (in shares)
Note 13 - Cash Flow Information - Changes in Operating Assets and Liabilities (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Vested, number of nonvested shares (in shares)
Note 13 - Cash Flow Information - Supplement Disclosure of Cash Flow Information (Details)
dakt_CommonShareRightsExercisePeriodOptionTwo
Common Share Rights Exercise, Period, Option Two (Year)
Represents option two of common share rights exercise period.
Guarantor Obligations, Nature [Axis]
Share-based Payment Arrangement, Cost by Plan [Table Text Block]
Shares vested and expected to vest (Year)
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1
Note 13 - Cash Flow Information - Supplement Schedule of Non-cash Investing and Financing Activities (Details)
Guarantor Obligations, Nature [Domain]
Note 14 - Fair Value Measurement - Fair Value Hierarchy (Details)
Note 14 - Fair Value Measurement - Contingent Liabilities (Details)
Shares vested and expected to vest
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue
Note 15 - Derivative Financial Instruments - Aggregated Notional Amount (Details)
Note 16 - Commitments and Contingencies - Change in Warranty Obligation (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
Shares vested and expected to vest (in shares)
Note 16 - Commitments and Contingencies - Purchase Commitments (Details)
Exercisable at May 1, 2021 (in dollars per share)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
Notes To Financial Statements
Notes To Financial Statements [Abstract]
Exercisable at May 1, 2021 (Year)
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value
dakt_NumberOfEmployeesVoluntaryRetirement
Number of Employees, Voluntary Retirement
The number of employees agreed to voluntary retire.
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value
dakt_VoluntaryRetirementCost
Voluntary Retirement Cost
The amount of voluntary retirement cost.
dakt_NumberOfEmployeesReductionInForce
Number of Employees, Reduction in Force
The number of employees reduced in force during period.
Exercisable at May 1, 2021 (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)
Outstanding, beginning of period, weighted average remaining contractual life (Year)
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2
Outstanding, aggregate intrinsic value
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Fair value of options granted (in dollars per share)
Commercial [Member]
Represents the commercial segment.
Live Events [Member]
Represents the live events segment.
High School Park and Recreation [Member]
Represents the high school park and recreation segment.
Transportation [Member]
Represents the transportation segment.
dakt_PayrollTaxEmployerDeferralUnderTheCaresAct
Payroll Tax, Employer, Deferral under the CARES Act
The amount of payroll tax deferred under the CARES Act.
us-gaap_PaymentsToAcquireMarketableSecurities
Purchases of marketable securities
dakt_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAverageExercisePrice
Antidilutive Securities Excluded from Computation of Earnings Per Share, Weighted Average Exercise Price (in dollars per share)
The weighted average exercise price of antidilutive securities.
Financial Instruments [Domain]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Outstanding, weighted average exercise price per share (in dollars per share)
Outstanding, weighted average exercise price per share (in dollars per share)
International [Member]
Represents the international segment.
Unique Configuration [Member]
Represents the unique configuration.
Contract liabilities - current
Contract liabilities
Limited Configuration [Member]
Represents limited configuration.
Canceled or forfeited, weighted average exercise price per share (in dollars per share)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
Service and Other [Member]
Represents the service and other.
Financial Instrument [Axis]
Goodwill and Intangible Assets Disclosure [Text Block]
Taxes, other than income taxes
dakt_ContractAndLeasesReceivableInterestRate
Contract and Leases Receivable, Interest Rate
The interest rate of contract and leases receivable.
Schedule of Goodwill [Table Text Block]
Granted, weighted average exercise price per share (in dollars per share)
us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Shares vested and expected to vest (in dollars per share)
us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Accrued expenses
Accrued Liabilities, Current, Total
Service-type Warranty Contracts [Member]
Represents the service-type warranty contracts.
Compensation
New contracts sold
Amount of increase in obligation to transfer good or service to customer for which consideration from customer has been received or is due, from new contract sold.
Foreign currency translation and other
dakt_ContractWithCustomerLiabilityIncreaseDecreaseForForeignCurrencyTranslationAndOther
Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration from customer has been received or is due, from foreign currency translation and other.
Income taxes payable
Lessee, Operating Leases [Text Block]
Accounts payable
Outstanding, shares (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Outstanding, shares (in shares)
Accrued Expenses [Member]
Primary financial statement caption encompassing accrued expenses.
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
Canceled or forfeited, shares (in shares)
Purchases of property and equipment included in accounts payable
Credit Facility [Axis]
Accrued employee benefits
Proceeds from sales of property, equipment and other assets
Credit Facility [Domain]
Contingent Consideration Liability [Member]
Represents the contingent consideration liability.
Claims liabilities
Trademarks [Member]
Restricted cash
dakt_RestrictedCashAndCashEquivalentsFairValueDisclosure
The fair value portion of restricted cash and cash equivalents.
us-gaap_PolicyTextBlockAbstract
Accounting Policies
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate
Warranty obligations
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)
Contributions of common stock under the ESPP
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date
Other Intangible Assets [Member]
us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchases of property and equipment
Dilution associated with stock compensation plans, shares (in shares)
us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)
Additional Financial Information Disclosure [Text Block]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)
Weighted average shares outstanding:
Income taxes, net of refunds
us-gaap_LossContingencyAccrualAtCarryingValue
Loss Contingency Accrual, Ending Balance
CURRENT LIABILITIES:
Treasury Stock [Text Block]
Product [Member]
us-gaap_Assets
TOTAL ASSETS
Plan Name [Axis]
Plan Name [Domain]
dakt_ContractWithCustomerLiabilityRevenueRecognizedDuringPeriod
Contract With Customer, Liability, Revenue Recognized During Period
Less: reductions for revenue recognized
Amount of revenue recognized during period including amounts previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.)
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)
Customer Relationships [Member]
Diluted loss per share, net income (loss)
us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Share-based Payment Arrangement, Expense, Tax Benefit
Non-current assets
Deferred income taxes
Computer Software, Intangible Asset [Member]
us-gaap_CapitalizedContractCostNet
Capitalized Contract Cost, Net, Total
Share-based Payment Arrangement [Text Block]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets, Major Class Name [Domain]
us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
Tax payments related to RSU issuances
Contract assets
us-gaap_ContractWithCustomerAssetNet
Award Type [Domain]
Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]
Award Type [Axis]
Surety Bond [Member]
Basic earnings per share, net income (loss)
Net income (loss)
Net income (loss)
Net income (loss)
Accumulated Amortization
Intangibles, net
Total expected amortization expense
Guarantee of Business Revenue [Member]
Standby Letters of Credit [Member]
Financial Standby Letter of Credit [Member]
Gross carrying amount
Restricted Stock [Member]
Share-based Payment Arrangement, Option [Member]
Foreign currency translation
us-gaap_GoodwillForeignCurrencyTranslationGainLoss
Antidilutive Securities [Axis]
Antidilutive Securities, Name [Domain]
Financing Receivables [Text Block]
Commitments and Contingencies Disclosure [Text Block]
Less accumulated depreciation
Property and equipment, net
Property, Plant and Equipment, Net, Ending Balance
Goodwill
Balance
Balance
Property and equipment, gross
us-gaap_AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables
Balance
Balance
us-gaap_EquityMethodInvestmentOwnershipPercentage
Equity Method Investment, Ownership Percentage
us-gaap_NotesReceivableGross
Financing Receivable, before Allowance for Credit Loss, Total
Derivative Instrument [Axis]
Derivative Contract [Domain]
CASH FLOWS FROM INVESTING ACTIVITIES:
us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Change in operating assets and liabilities
Earnings (loss) per share:
Long-term marketing obligations and other payables
us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Income taxes payable
us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Equity in losses of affiliates
Income (Loss) from Equity Method Investments, Total
Equity in loss of affiliate
us-gaap_RelatedPartyTransactionAmountsOfTransaction
Related Party Transaction, Amounts of Transaction
Letter of Credit [Member]
us-gaap_EquityMethodInvestments
Equity Method Investments
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income (loss) before income taxes
Line of Credit [Member]
Income tax expense (benefit)
Income Tax Expense (Benefit), Total
Accrued expenses
us-gaap_IncreaseDecreaseInAccruedLiabilities
Equipment Held For Rental [Member]
Represents equipment held for rental.
Other
us-gaap_OtherNonoperatingGainsLosses
Accounts payable
us-gaap_IncreaseDecreaseInAccountsPayable
Demonstration Equipment [Member]
Represents information related to demonstration equipment.
Operating Expenses, Total
us-gaap_OperatingExpenses
us-gaap_DefinedContributionPlanCostRecognized
Defined Contribution Plan, Cost
General and administrative
General and administrative
us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent
Restricted cash
Restricted cash
us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay
Cash and cash equivalents
Cash and cash equivalents
Share-based compensation expense
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
Interest
Amendment Flag
ICFR Auditor Attestation Flag
us-gaap_ComprehensiveIncomeNetOfTax
Comprehensive income (loss)
City Area Code
Use of Estimates, Policy [Policy Text Block]
New Accounting Pronouncements, Policy [Policy Text Block]
Office Furniture and Equipment [Member]
Represents office furniture and equipment.
Computer Software and Hardware [Member]
Represents computer software and hardware.
us-gaap_GainLossOnSaleOfPropertyPlantEquipment
(Gain) loss on sale of property, equipment and other assets
Contract liabilities
us-gaap_IncreaseDecreaseInContractWithCustomerLiability
us-gaap_IncreaseDecreaseInOtherOperatingAssets
Investment in affiliates and other assets
Current Fiscal Year End Date
us-gaap_NotesReceivableNet
Financing Receivable, after Allowance for Credit Loss, Total
us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Prepaid expenses and other current assets
us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent
Operating Lease, Weighted Average Discount Rate, Percent
Fiscal Period, Policy [Policy Text Block]
Document Fiscal Period Focus
us-gaap_OperatingLeaseCost
Operating Lease, Cost
Document Fiscal Year Focus
Consolidation, Policy [Policy Text Block]
Document Period End Date
us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1
Operating Lease, Weighted Average Remaining Lease Term (Year)
Entity File Number
Entity Emerging Growth Company
Document Type
Entity Small Business
Entity Shell Company
us-gaap_DividendsCommonStockCash
Dividends paid
Document Information [Line Items]
Document Information [Table]
Service [Member]
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Acquisition-related contingent consideration as of May 2, 2020
Acquisition-related contingent consideration as of May 1, 2021
Entity Public Float
us-gaap_SeveranceCosts1
Severance Costs
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
Settlements
Entity Filer Category
Entity Current Reporting Status
Entity Voluntary Filers
Entity Well-known Seasoned Issuer
Additions
us-gaap_IncreaseDecreaseInIncomeTaxesReceivable
Income taxes receivables
us-gaap_GoodwillImpairmentLoss
Goodwill, Impairment Loss
Share-based compensation
us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap_IncreaseDecreaseInAccountsReceivable
Account receivable
Statement of Comprehensive Income [Abstract]
Entity Tax Identification Number
Entity Central Index Key
Entity Registrant Name
Liability Class [Axis]
Fair Value by Liability Class [Domain]
Entity [Domain]
Legal Entity [Axis]
Entity Address, Address Line One
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
us-gaap_AmortizationOfIntangibleAssets
Amortization of Intangible Assets, Total
us-gaap_TreasuryStockValueAcquiredCostMethod
Treasury stock purchase
Entity Address, City or Town
Entity Address, Postal Zip Code
Entity Address, State or Province
us-gaap_TreasuryStockValue
Treasury stock, at cost, 1,297,409 and 1,343,281 shares at May 1, 2021 and May 2, 2020, respectively
us-gaap_StockRepurchasedDuringPeriodShares
Stock Repurchased During Period, Shares (in shares)
us-gaap_IncreaseDecreaseInLongTermReceivablesCurrent
Long-term receivables
Entity Common Stock, Shares Outstanding
Treasury stock reissued
us-gaap_StockRepurchasedDuringPeriodValue
Stock Repurchased During Period, Value
us-gaap_AdvertisingExpense
Advertising Expense
us-gaap_IncreaseDecreaseInInventories
Inventories
Trading Symbol
us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)
Local Phone Number
us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Line of Credit Facility, Remaining Borrowing Capacity
us-gaap_TableTextBlock
Notes Tables
Employee savings plan activity
us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Line of Credit Facility, Maximum Borrowing Capacity
Exercise of stock options
us-gaap_LineOfCreditFacilityExpirationPeriod
Line of Credit Facility, Expiration Period (Year)
Provision for doubtful accounts, net of recovery
Granted, shares (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Raw materials
Selling
Selling
us-gaap_LiabilitiesAndStockholdersEquity
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY
Finished goods
Work-in-process
UNITED STATES
us-gaap_IncreaseDecreaseInContractWithCustomerAsset
Contract assets
Retained earnings
Product design and development
Product design and development
Accumulated other comprehensive loss
Non-current assets
us-gaap_AssetsNoncurrent
Debt Disclosure [Text Block]
XDC [Member]
Represents XDC.
us-gaap_InterestExpense
Interest expense
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:
us-gaap_DisclosureTextBlockAbstract
Notes to Financial Statements
Derivative Instruments and Hedging Activities Disclosure [Text Block]
us-gaap_OperatingLeaseLiabilityNoncurrent
Operating Lease, Liability, Noncurrent
Schedule of Cash and Cash Equivalents [Table Text Block]
Schedule of Inventory, Current [Table Text Block]
Total lease liabilities
Operating lease liabilities
Operating Lease, Liability, Current
Retirement Benefits [Text Block]
us-gaap_OperatingLeaseRightOfUseAsset
Operating Lease, Right-of-Use Asset
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Total lease payments
us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
Less imputed interest
Investment in affiliates and other assets
us-gaap_DeferredIncomeTaxExpenseBenefit
Deferred income taxes, net
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Thereafter
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree
2024
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour
2025
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive
2026
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive
Thereafter
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2023
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2024
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2025
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
2022
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
2026
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
2023
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2022
Foreign Currency Transactions and Translations Policy [Policy Text Block]
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
Share-based compensation
Share-based compensation
Weighted average life (Year)
Earnings Per Share, Policy [Policy Text Block]
Long-term receivables, less current maturities
Depreciation and amortization
Operating expenses:
Comprehensive Income, Policy [Policy Text Block]
Income Tax, Policy [Policy Text Block]
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Schedule of Other Significant Noncash Transactions [Table Text Block]
us-gaap_FairValueNetAssetLiability
Fair Value, Net Asset (Liability), Total
us-gaap_LesseeOperatingLeaseTermOfContract
Lessee, Operating Lease, Term of Contract (Year)
Research and Development Expense, Policy [Policy Text Block]
us-gaap_Depreciation
Depreciation, Total
Depreciation and amortization
us-gaap_DepreciationDepletionAndAmortization
Derivatives - asset position
Foreign Currency Contract, Asset, Fair Value Disclosure
us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
Foreign Currency Contracts, Liability, Fair Value Disclosure
Derivatives - liability position
Current assets
us-gaap_AssetsCurrent
Total current assets
Cash and cash equivalents
us-gaap_CashAndCashEquivalentsFairValueDisclosure
Share-based Payment Arrangement [Policy Text Block]
dakt_ProductWarrantyAccrualInstallationWarrantyCoverageTerm
Product Warranty Accrual, Installation Warranty Coverage Term (Year)
Represents installation warranty coverage term for product warranty accrual.
Nature of Business [Policy Text Block]
Disclosure of accounting policy for natural of business.
Revenue Recognition, Long-term Receivables and Advertising Rights [Policy Text Block]
Disclosure of accounting policy for revenue recognition for long-term receivables and advertising rights.
dakt_ProductWarrantyAccrualStandardPartsWarrantyCoverageTerm
Product Warranty Accrual, Standard Parts Warranty Coverage Term (Year)
Represents standard parts warrant coverage term for product warranty accrual.
Income tax receivables
Contingent consideration adjustment
Treasury stock, shares (in shares)
Property and equipment and other assets available for sale
Advertising Cost [Policy Text Block]
Common stock, no par value, authorized 115,000,000 shares; 46,264,576 and 45,913,209 shares issued at May 1, 2021 and May 2, 2020, respectively
Measurement Frequency [Axis]
Measurement Frequency [Domain]
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Fair Value, Recurring [Member]
Common stock, share authorized (in shares)
Common Stock, Shares Authorized (in shares)
Common stock, share issued (in shares)
Certificates of Deposit [Member]
Common stock, no par value (in dollars per share)
Revenue from Contract with Customer [Policy Text Block]
Deferred Tax Asset [Domain]
us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Common Stock, Capital Shares Reserved for Future Issuance (in shares)
us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Assets, Valuation Allowance, Total
Valuation allowance
Statistical Measurement [Domain]
Operating cash flows from operating leases
Maximum [Member]
Minimum [Member]
Valuation Allowance by Deferred Tax Asset [Axis]
Product and Service [Axis]
Product and Service [Domain]
us-gaap_DeferredTaxAssetsNet
Net deferred tax assets
Statistical Measurement [Axis]
Investment, Name [Domain]
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
Cash Flow, Operating Capital [Table Text Block]
Contract assets
us-gaap_DeferredTaxAssetsLiabilitiesNet
Net deferred tax asset
Interest
Cash Flow, Supplemental Disclosures [Text Block]
Investment, Name [Axis]
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]
Other
Property and equipment, net of accumulated depreciation
us-gaap_NoncurrentAssets
Geographical [Axis]
Goodwill and Intangible Assets, Policy [Policy Text Block]
Property, Plant and Equipment [Table Text Block]
us-gaap_DeferredTaxAssetsGross
Total deferred tax assets
Geographical [Domain]
us-gaap_DeferredIncomeTaxLiabilities
Total deferred tax liabilities
Property, Plant and Equipment, Impairment [Policy Text Block]
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
Inventories
Inventory, Net, Total
Fair Value, Inputs, Level 3 [Member]
Foreign currency transaction (losses) gains
Deferred maintenance revenue
Lessee, Operating Lease, Disclosure [Table Text Block]
Unrealized loss on foreign currency exchange
Fair Value Hierarchy and NAV [Domain]
Inventory capitalization
Fair Value, Inputs, Level 1 [Member]
Fair Value, Inputs, Level 2 [Member]
Fair Value Hierarchy and NAV [Axis]
us-gaap_ProductWarrantyAccrualPayments
Settlements made during the period
Allowance for excess and obsolete inventory
Lease accounting - lease liability
Warranties issued during the period
Changes in accrued warranty obligations for pre-existing warranties during the period, including expirations
Legal reserve
Estimated useful life (Year)
CASH FLOWS FROM OPERATING ACTIVITIES:
Accrued warranty obligations
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Allowance for doubtful accounts
Current maturities of long-term receivables
Employee Stock [Member]
Statement [Line Items]
Vacation accrual
us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accounts Receivable, Allowance for Credit Loss, Current
Accounts receivable, net
Accounts Receivable, after Allowance for Credit Loss, Current, Total
Accrued compensation and benefits
us-gaap_NumberOfReportableSegments
Number of Reportable Segments
Additional paid-in capital
Equity compensation
Building and Building Improvements [Member]
Building [Member]
AOCI Attributable to Parent [Member]
Schedule of Product Warranty Liability [Table Text Block]
SHAREHOLDERS' EQUITY:
Land [Member]
Marketable securities
Other (expense) income, net
Other (expense) income, net
Other Nonoperating Income (Expense), Total
Long-Lived Tangible Asset [Axis]
Segment Reporting Disclosure [Text Block]
Long-Lived Tangible Asset [Domain]
Net operating loss carry forwards
Guarantees [Member]
Research and development tax credit carry forwards
CURRENT ASSETS:
Interest income
Interest income
Fair Value Disclosures [Text Block]
us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction
Sale of Stock, Percentage of Ownership after Transaction
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
Total cash, cash equivalents, and restricted cash shown in the consolidated statements of cash flows
Beginning of period
End of period
Inventory, Policy [Policy Text Block]
us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign
Deferred Tax Assets, Operating Loss Carryforwards, Foreign
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash used in financing activities
EFFECT OF EXCHANGE RATE CHANGES ON CASH
Operating income (loss)
us-gaap_OperatingIncomeLoss
Operating income (loss)
us-gaap_NetCashProvidedByUsedInOperatingActivities
Net cash provided by operating activities
Nonoperating income (expense):
us-gaap_DeferredTaxLiabilitiesOther
Other
us-gaap_DeferredTaxLiabilities
Deferred Tax Liabilities, Net, Total
Prepaid expenses and other current assets
us-gaap_NetCashProvidedByUsedInInvestingActivities
Net cash used in investing activities
us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Intangible assets
Cost of sales
Gross profit
us-gaap_GrossProfit
Gross profit
us-gaap_DeferredIncomeTaxLiabilitiesNet
Deferred income taxes
Non-current liabilities
Consolidation Items [Domain]
us-gaap_ContractWithCustomerLiability
Balance at beginning of year
Balance at end of year
us-gaap_DeferredTaxLiabilitiesLeasingArrangements
Lease accounting - right of use asset
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
Consolidation Items [Axis]
us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total
Investment, Policy [Policy Text Block]
us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Tax payments related to RSU issuances
us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains
Unrealized gain on foreign currency exchange
us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Property and equipment
us-gaap_DeferredTaxLiabilitiesPrepaidExpenses
Prepaid expenses
Demonstration equipment transferred to inventory
Amount of demonstration equipment transferred to inventory in noncash or part noncash transactions.
dakt_GovernmentWageSubsidy
Government Wage Subsidy
Amount of government wage subsidy received during the period.
dakt_DebtInstrumentCovenantInterestbearingDebtToEBITDARatio
Debt Instrument, Covenant, Maximum Interest-bearing Debt to EBITDA Ratio
The maximum ratio of interest-bearing debt to earnings before income taxes, depreciation, and amortization allowed under the covenant of the debt instrument.
us-gaap_PaymentsOfDividendsCommonStock
Dividends paid
Equity Method Investments [Table Text Block]
us-gaap_ProductWarrantyAccrual
Beginning accrued warranty obligations
Ending accrued warranty obligations
dakt_InterestExpenseReversalOfExpense
Interest expense
Amount of the cost (reversal of cost) of borrowed funds accounted for as interest expense.
us-gaap_PaymentsForRepurchaseOfCommonStock
Payments for common shares repurchased
Retained Earnings [Member]
Proceeds from exercise of stock options
Proceeds from Stock Options Exercised
Net sales
Net sales
Title of Individual [Domain]
State
us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Title of Individual [Axis]
Treasury Stock [Member]
State
us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Stock Repurchase Program, Remaining Authorized Repurchase Amount
Foreign
us-gaap_CurrentForeignTaxExpenseBenefit
Foreign
us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Additional Paid-in Capital [Member]
Common Stock [Member]
Federal
us-gaap_CurrentFederalTaxExpenseBenefit
Preferred Stock [Member]
us-gaap_StockRepurchaseProgramAuthorizedAmount1
Stock Repurchase Program, Authorized Amount
Federal
us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Equity Components [Axis]
Equity Component [Domain]
Accounts Payable and Accrued Liabilities [Member]
us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)
us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)
Other Liabilities [Member]
us-gaap_RevenueRemainingPerformanceObligation
Revenue, Remaining Performance Obligation, Amount
Class of Warrant or Right [Axis]
Other Noncurrent Liabilities [Member]
Class of Warrant or Right [Domain]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)
Foreign
Income (loss) before income taxes
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income (loss) before income taxes
Domestic
Accounts Receivable, Allowance for Credit Loss [Table Text Block]
Other comprehensive income (loss):
us-gaap_LineOfCredit
Long-term Line of Credit, Total
State and Local Jurisdiction [Member]
Timing of Transfer of Good or Service [Domain]
Income Tax Authority, Name [Axis]
Transferred at Point in Time [Member]
Income Tax Authority, Name [Domain]
Transferred over Time [Member]
Internal Revenue Service (IRS) [Member]
Income Tax Authority [Axis]
Income Tax Authority [Domain]
Disaggregation of Revenue [Table Text Block]
Domestic Tax Authority [Member]
Foreign Tax Authority [Member]
Timing of Transfer of Good or Service [Axis]
us-gaap_RepaymentsOfLongTermDebt
Principal payments on long-term obligations
Revenue from Contract with Customer [Text Block]
Transportation Equipment [Member]
Document Annual Report
Machinery and Equipment [Member]
Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block]
Computer Equipment [Member]
Cash and Cash Equivalents, Policy [Policy Text Block]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]
Entity Incorporation, State or Country Code
us-gaap_UnrecognizedTaxBenefits
Balance at beginning of year
Balance at end of year
General and Administrative Expense [Member]
us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Unrecognized Tax Benefits that Would Impact Effective Tax Rate
Accounting Policies [Abstract]
us-gaap_OpenTaxYear
Open Tax Year
Document Transition Report
us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations
Lapse of statute of limitations
Entity Interactive Data Current
Selling and Marketing Expense [Member]
Dividends declared, price per share (in dollars per share)
Charged to costs and expenses
us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease
Gross increases related to prior period tax positions
Security Exchange Name
Operating Expense [Member]
us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Gross decreases related to prior period tax positions
Gross increases related to current period tax positions
Title of 12(b) Security
us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Deductions
Equity Method Investment, Nonconsolidated Investee [Axis]
Financing Receivable [Member]
Receivable Type [Axis]
Cost of Sales [Member]
Receivable [Domain]
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Equity Method Investment, Nonconsolidated Investee [Domain]
Research and Development Expense [Member]
Income Statement Location [Axis]
Income Statement Location [Domain]
Short-term accrued expenses
Retainage on Construction-type Contracts [Member]
Represents retainage on construction-type contracts.
Segments [Axis]
Segments [Domain]
Long-term warranty obligations
us-gaap_RepaymentsOfNotesPayable
Payments on notes payable
us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)
dakt_DefinedContributionPlanAwardRequisiteServicePeriod
Defined Contribution Plan, Award Requisite Service Period (Month)
Represents award requisite service period for defined contribution plan.
Diluted earnings per share, shares (in shares)
Diluted (in shares)
Borrowings on notes payable
us-gaap_PurchaseObligation
Purchase Obligation, Total
Warranty obligations
dakt_IncreaseDecreaseInShorttermWarrantyObligation
Represents increase (decrease) in short-term warranty obligation.
Long-term warranty obligations
dakt_IncreaseDecreaseInLongtermWarrantyObligation
Represents increase (decrease) in long-term warranty obligation.
Non-US [Member]
us-gaap_OperatingLossCarryforwards
Operating Loss Carryforwards, Total
us-gaap_PurchaseObligationDueInFourthYear
2025
us-gaap_PurchaseObligationDueInFifthYear
2026
dakt_DefinedContributionPlanAttainedAge
Defined Contribution Plan, Attained Age (Year)
Represents attained age for defined contributing plan.
us-gaap_PurchaseObligationDueInSecondYear
2023
Statement [Table]
us-gaap_PurchaseObligationDueInThirdYear
2024
Statement of Financial Position [Abstract]
Diluted earnings per share (in dollars per share)
Diluted (in dollars per share)
Basic earnings per share, shares (in shares)
Basic (in shares)
us-gaap_PurchaseObligationDueInNextTwelveMonths
2022
Restricted Stock and Restricted Stock Units [Member]
Represents restricted stock and restricted stock units.
Basic earnings per shar (in dollars per share)
Basic (in dollars per share)
Available-for-sale securities:
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]
Statement of Cash Flows [Abstract]
Statement of Stockholders' Equity [Abstract]
Income Statement [Abstract]
us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Total other comprehensive income (loss), net of tax
us-gaap_BusinessCombinationContingentConsiderationLiability
Acquisition-related contingent consideration
Schedule of Accrued Liabilities [Table Text Block]
Other Business Developments Coronavirus Pandemic, Policy [Policy Text Block]
Disclosure of accounting policy for other business developments related to coronavirus pandemic.
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
In Money Options [Member]
Represents in money options.
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
Schedule of Nonvested Restricted Stock and Restricted Stock Units Activity [Table Text Block]
Tabular disclosure of nonvested restricted stock and restricted stock units activity.
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Independent Directors [Member]
Represents the independent directors of the company.
us-gaap_OtherCommitment
Other Commitment, Total
Employees [Member]
Represents the employees of the company.
Employee Stock Purchase Plan [Member]
Represents the employee stock purchase plan.
Property, Plant and Equipment, Estimated Useful Life [Table Text Block]
Tabular disclosure of estimated useful life of property, plant and equipment.
dakt_CommonStockSharesAuthorizedAndUndesignated
Common Stock, Shares Authorized and Undesignated (in shares)
The number of authorized and undesignated common shares.
dakt_CommonStockSharesUndesignated
Common Stock, Shares Undesignated (in shares)
The number of undesignated shares.
dakt_CommonSharePurchaseRightPerCommonShareRatio
Common Share Purchase Right Per Common Share, Ratio
Represents the purchase right of each common share.
Preferred Share Purchase Right [Member]
Represents the preferred share purchase right.
U.S. Dollars/Canadian Dollars [Member]
Represents the foreign currency exchange forward contracts for U.S. Dollars/Canadian Dollars.
U.S. Dollars/British Pounds [Member]
Represents the foreign currency exchange forward contracts for U.S. Dollars/British Pounds.
U.S. Dollars/Euros [Member]
Represents the foreign currency exchange forward contracts for U.S. Dollars/Euros.
Deferred Tax Asset, Net Operating Loss [Member]
Represents the deferred tax asset attributable to net operating loss.
dakt_OperatingLeaseExpenseForExtension
Operating Lease, Expense for Extension
The amount of expenses for lease extension.
U.S. Dollars/Australian Dollars [Member]
Represents the foreign currency exchange forward contracts for U.S. Dollars/Australian Dollars.
Non-current liabilities
us-gaap_LiabilitiesNoncurrent
Total long-term liabilities
Other, net
CASH FLOWS FROM FINANCING ACTIVITIES:
GILTI
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Other long-term obligations
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount
Change in valuation allowances
Corporate, Non-Segment [Member]
Change in uncertain tax positions
Base Erosion Anti-Abuse Tax (BEAT)
us-gaap_IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends
Dividends paid to retirement plan
us-gaap_StockholdersEquity
TOTAL SHAREHOLDERS' EQUITY
Balance
Balance
Contract liabilities - non-current
Long-term contract liabilities
Long-term income tax payable
us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Acquisitions, net of cash acquired
us-gaap_PaymentsToAcquireEquityMethodInvestments
Purchases of and loans to equity investment
Class of Stock [Axis]
Class of Stock [Domain]
Stock compensation
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Meals and entertainment
Operating Segments [Member]
us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share)
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
State taxes, net of federal benefit
us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Research and development tax credit