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Note 9 - Income Taxes (Details Textual)
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Effective Income Tax Rate Reconciliation, Percent, Total 16.40% 23.90% 15.10% 8.40%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%   21.00%