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Note 10 - Derivative Financial Instruments (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Derivative Instruments, Loss Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing $ 0 $ 0 $ 0
Interest Rate Swap [Member]      
Derivative, Notional Amount $ 200,000    
Derivative, Average Fixed Interest Rate 1.27%    
Foreign Exchange Forward [Member]      
Outstanding Forward Contracts, Net Unrealized Gain (Loss) $ 2,500 $ 3,100