Note J - Derivatives and Hedging (Details Textual) € in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2018 EUR (€)	Jun. 30, 2017 USD ($)
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net, Total	$ 0	$ 97,000	$ 0	$ 189,000
Unrealized Loss on Foreign Currency Derivatives, before Tax			2,900,000
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	3,100,000		3,100,000
Hedging Liabilities, Current	2,631,000		2,631,000			$ 422,000
Hedging Liabilities, Noncurrent	480,000		480,000			$ 99,000
Reclassification out of Accumulated Other Comprehensive Income [Member]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	2,400,000		2,400,000
Cash Flow Hedging [Member]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	1,200,000	322,000	4,100,000	1,500,000
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	974,000	$ 278,000	1,800,000	$ 549,000
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]
Derivative, Notional Amount	$ 47,100,000		$ 47,100,000		€ 40