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Note 13 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Income Tax Expense (Benefit), New Tax Act, Transition Tax for Accumulated Foreign Earnings $ (779)        
Effective Income Tax Rate Reconciliation, Percent, Total 23.60% 129.00% 26.60% 74.20%  
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount         $ 15,000