Note K - Derivatives and Hedging (Details Textual) € in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 EUR (€)	Jun. 30, 2019 USD ($)
Unrealized Gain on Foreign Currency Derivatives, before Tax			$ 276,000
Cash Flow Hedge Derivative Instrument Assets at Fair Value	$ 1,600,000		1,600,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(369,000)	$ 1,300,000	932,000	$ 1,800,000
Nonoperating Income (Expense) [Member]
Gain (Loss) on Derivative Instruments, Net, Pretax, Total	261,000	464,000	498,000	951,000
Prepaid Expenses and Other Current Assets [Member]
Cash Flow Hedge Derivative Instrument Assets at Fair Value						$ 2,000,000
Other Noncurrent Assets [Member]
Cash Flow Hedge Derivative Instrument Assets at Fair Value						$ 312,000
Reclassification out of Accumulated Other Comprehensive Income [Member]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	305,000		305,000
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total	$ 808,000	$ 211,000	1,600,000	$ 169,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Other Income, Effective Portion, Net			$ 54,000
Foreign Exchange Contract [Member]
Discontinuation of Cash Flow Hedge	0	0	0	0
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]
Derivative, Notional Amount	$ 40,500,000		$ 40,500,000		€ 34.2