Note K - Derivatives and Hedging (Details Textual) € in Millions	3 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 EUR (€)	Jun. 30, 2020 USD ($)
Accumulated Other Comprehensive Income (Loss) Cumulative Cash Flow Hedges, Gain (Loss)	$ (1,800,000)
Other Current Liabilities [Member]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	2,500,000
Other Noncurrent Assets [Member]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	100,000
Other Current Assets [Member]
Cash Flow Hedge Derivative Instrument Assets at Fair Value				$ 500,000
Other Noncurrent Liabilities [Member]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value				$ 200,000
Reclassification out of Accumulated Other Comprehensive Income [Member]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	1,900,000
Cash Flow Hedging [Member]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(2,100,000)	$ 1,300,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total	600,000	54,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Interest Income, Effective Portion, Net		$ 800,000
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]
Derivative, Notional Amount	$ 75,700,000		€ 66.2