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Note K - Derivatives and Hedging (Details Textual) € in Millions, SFr in Millions | Aug. 18, 2021 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 EUR (€) | Dec. 31, 2023 CHF (SFr) | Aug. 23, 2021
--- | --- | --- | --- | --- | ---
Accumulated Other Comprehensive Income (Loss) Cumulative Cash Flow Hedges, Gain (Loss) |  | $ (100,000) |  |  |
Deferred Tax Assets, Derivative Instruments |  | 26,000 |  |  |
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 |  |  |  |
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 |  | 13,100,000 |  | SFr 11.3 |
Interest Rate Swap [Member] |  |  |  |  |
Derivative, Fixed Interest Rate | 2.40% |  |  |  | 2.40%
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] |  |  |  |  |
Derivative, Notional Amount |  | $ 18,100,000 | € 16.3 |  |

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