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Note 10 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Effective Income Tax Rate Reconciliation, Disposition of Asset, Amount   $ (900)  
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount $ 600 700 $ 500
Effective Income Tax Rate Reconciliation, Income Tax Rate Differential, Other Jurisdictions, Amount (5,300) (4,900) (4,000)
Valuation Allowances and Reserves, Period Increase (Decrease) 900    
Income Tax Expense (Benefit) 15,355 16,295 $ 20,874
Undistributed Earnings of Foreign Subsidiaries 229,300    
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 2,500    
Unrecognized Tax Benefits, Interest on Income Taxes Accrued 100 $ 100  
Accounting Standards Update 2016-09 [Member]      
Income Tax Expense (Benefit) (600)    
State and Local Jurisdiction [Member]      
Tax Credit Carryforward, Amount 2,500    
Operating Loss Carryforwards 56,600    
Foreign Tax Authority [Member]      
Operating Loss Carryforwards 2,400    
Foreign Tax Authority [Member] | Indefinite Lived [Member]      
Operating Loss Carryforwards 1,900    
Foreign Tax Authority [Member] | Ten Years [Member]      
Operating Loss Carryforwards $ 500