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Note 11 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Effective Income Tax Rate Before Discretion, at Federal Statutory Income Tax Rate, Percent         28.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability $ 178       $ 1,400
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount $ 633       $ 13,100
Tax Period, Repatriation of Foreign Earnings         8 years
Effective Income Tax Rate Reconciliation, Percent, Total 23.40% 27.30% 54.40% 24.10%  
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount $ 500       $ 14,600