Note K - Derivatives and Hedging (Details Textual) € in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2020 EUR (€)	Jun. 30, 2019 USD ($)
Unrealized Gain on Foreign Currency Derivatives, before Tax	$ 713,000
Cash Flow Hedge Derivative Instrument Assets at Fair Value	1,700,000			$ 1,700,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	990,000	$ 1,400,000		1,900,000	$ 4,100,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total		450,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Other Income, Effective Portion, Net					1,400,000
Nonoperating Income (Expense) [Member]
Gain (Loss) on Derivative Instruments, Net, Pretax, Total	209,000	368,000		707,000	1,300,000
Prepaid Expenses and Other Current Assets [Member]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	1,600,000			1,600,000			$ 2,000,000
Other Noncurrent Assets [Member]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	100,000			100,000			$ 312,000
Reclassification out of Accumulated Other Comprehensive Income [Member]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	633,000			633,000
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total	554,000			2,100,000	$ 619,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Other Income, Effective Portion, Net		$ 490,000	$ 54,000
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]
Derivative, Notional Amount	$ 30,400,000			$ 30,400,000		€ 26