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Note K - Derivatives and Hedging (Details Textual) € in Millions, SFr in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Aug. 18, 2021 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2023 EUR (€) | Mar. 31, 2023 CHF (SFr)
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.29% |  |
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Term Loan [Member] |  |  |  |
Debt Instrument, Face Amount | $ 10,000,000.0 |  |  |
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Term Loan [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.80% |  |  |
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative, Notional Amount |  | $ 12,200,000 |  | SFr 11.4
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member] |  |  |  |
Derivative, Notional Amount |  | 24,000,000.0 | € 21.4 |
Accumulated Other Comprehensive Income (Loss) Cumulative Cash Flow Hedges, Gain (Loss) |  | 50,000 |  |
Deferred Tax Assets, Derivative Instruments |  | 6,000 |  |
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months |  | $ 50,000 |  |
Interest Rate Swap [Member] |  |  |  |
Derivative, Fixed Interest Rate | 2.40% |  |  |

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