Note J - Derivatives and Hedging (Details Textual) € in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2018 EUR (€)	Jun. 30, 2018 USD ($)
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net, Total	$ 0	$ 0	$ 0	$ 0
Unrealized Loss on Foreign Currency Derivatives, before Tax			1,300,000
Cash Flow Hedge Derivative Instrument Assets at Fair Value	2,500,000		2,500,000
Prepaid Expenses and Other Current Assets [Member]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	1,800,000		1,800,000			$ 55,000
Other Noncurrent Assets [Member]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	682,000		682,000			46,000
Accrued Liabilities [Member]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value						$ 101,000
Reclassification out of Accumulated Other Comprehensive Income [Member]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	859,000		859,000
Cash Flow Hedging [Member]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	1,300,000	731,000	1,800,000	2,900,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total	211,000		169,000
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion		$ 428,000		$ 850,000
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]
Derivative, Notional Amount	$ 71,000,000		$ 71,000,000		€ 58.5