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Note J - Derivatives and Hedging (Details Textual)
€ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
EUR (€)
Jun. 30, 2017
USD ($)
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net $ 0 $ 92,000 $ 0 $ 92,000    
Unrealized Loss on Foreign Currency Derivatives, before Tax     2,700,000      
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value 2,700,000   2,700,000      
Hedging Liabilities, Current 2,088,000   2,088,000     $ 422,000
Hedging Liabilities, Noncurrent 609,000   609,000     $ 99,000
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion 731,000          
Reclassification out of Accumulated Other Comprehensive Income [Member]            
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months 2,000,000   2,000,000      
Cash Flow Hedging [Member]            
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion     2,900,000      
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion 428,000   850,000      
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion   2,300,000   1,800,000    
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion   $ 213,000   $ 271,000    
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]            
Derivative, Notional Amount $ 52,600,000   $ 52,600,000   € 45.3