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Note O - Income taxes (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Tax Expense (Benefit), Total | $ 4,314,700 | $ (62,716) | $ 7,271,580 | $ (340,484)
Effective Income Tax Rate Reconciliation, Percent, Total |  |  | 22.90% | 23.50%

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