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Note 10 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Effective Income Tax Rate Reconciliation, Percent, Total (12.40%) 16.00% (24.20%) 14.80%  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     21.00%    
Unrecognized Tax Benefits, Ending Balance         $ 630
Tax Cuts and Jobs Act, Income Tax Expense (Benefit), Total $ (630)