Note K - Derivatives and Hedging (Details Textual) € in Millions, SFr in Millions, $ in Millions		15 Months Ended
	Aug. 18, 2021 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 EUR (€)	Sep. 30, 2023 CHF (SFr)	Aug. 23, 2021
Accumulated Other Comprehensive Income (Loss) Cumulative Cash Flow Hedges, Gain (Loss)		$ 0.5
Deferred Tax Assets, Derivative Instruments		$ 0.1
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	$ 10.0
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		$ 14.6		SFr 12.6
Interest Rate Swap [Member]
Derivative, Fixed Interest Rate	2.40%				2.40%
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
Derivative, Notional Amount		$ 23.0	€ 20.8