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Note O - Income Taxes (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Income Tax Expense (Benefit), Total $ 639,152 $ (264,550) $ 298,668 $ (678,043)
Effective Income Tax Rate Reconciliation, Percent, Total     22.60% 23.30%