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Note 9 - Income Taxes (Details Textual)
3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Percent, Total 11.00% 9.50% 20.70% 8.60%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%   21.00%