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Note K - Income Taxes (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Tax Expense (Benefit), Total $ (487,992) $ 644,709 $ (413,493) $ 1,807,329
Effective Income Tax Rate Reconciliation, Percent, Total     23.50% 24.40%