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Note J - Segment Information (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Gain (Loss) on Extinguishment of Debt, Total |  | $ 1,706,614 | $ (0)
Paycheck Protection Program CARES Act [Member] |  |  |
Gain (Loss) on Extinguishment of Debt, Total |  | 1,706,614 |
Nonoperating Income (Expense) [Member] | Paycheck Protection Program CARES Act [Member] |  |  |
Gain (Loss) on Extinguishment of Debt, Total |  | 1,706,614 |
Nonoperating Income (Expense) [Member] | Hot-rolled Coil Steel Contracts [Member] |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Loss | $ 6,830,780 | $ 8,219,740 |

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