Note K - Derivatives and Hedging (Details Textual) € in Millions, SFr in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 EUR (€)	Dec. 31, 2020 CHF (SFr)	Jun. 30, 2020 USD ($)
Accumulated Other Comprehensive Income (Loss) Cumulative Cash Flow Hedges, Gain (Loss)	$ 3,000,000		$ 3,000,000
Prepaid Expenses and Other Current Assets [Member]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	3,200,000		3,200,000
Other Noncurrent Assets [Member]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	400,000		400,000
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	2,500,000		2,500,000
Cash Flow Hedging [Member]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(1,900,000)	$ (400,000)	(3,900,000)	$ 900,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Interest Income, Effective Portion, Net	(700,000)	$ 800,000	(1,300,000)	1,600,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total				$ 54,000
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative, Notional Amount	6,600,000		6,600,000			SFr 5.8
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]
Derivative, Notional Amount	$ 53,500,000		$ 53,500,000		€ 46.5