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Note 11 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Effective Income Tax Rate Before Discretion, at Federal Statutory Income Tax Rate, Percent 21.00%    
Deferred Tax Liabilities, Previously Undistributed Foreign Earnings $ 1,200    
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount 1,200    
Effective Income Tax Rate Reconciliation, Mix of Income in Various Jurisdictions 1,400    
Effective Income Tax Rate Reconciliation, Release of Uncertain Tax Provision Reserves 700    
Effective Income Tax Rate Reconciliation, GILTI 800    
Effective Income Tax Rate Reconciliation, Section 965 Toll Tax, Amount   $ 800 $ 11,700
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability   300 1,300
Effective Income Tax Rate Reconciliation, Anticipated Cash Repatriation, Amount   2,100 7,800
Income Tax Expense (Benefit), Total 13,060 18,688 $ 38,026
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 8,400    
Unrecognized Tax Benefits, Interest on Income Taxes Accrued 100 $ 100  
Accounting Standards Update 2016-09 [Member]      
Income Tax Expense (Benefit), Total 200    
State and Local Jurisdiction [Member]      
Operating Loss Carryforwards, Total 79,500    
Tax Credit Carryforward, Amount 3,400    
Foreign Tax Authority [Member]      
Operating Loss Carryforwards, Total 4,400    
Operating Loss Carryforwards, Subject to Expiration 3,500    
Operating Loss Carryforwards, Not Subject to Expiration 900    
Deferred Tax Related to Sale of Segment [Member]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 1,800