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Note 13 - Industry Segment Data (Details Textual) - USD ($) | 12 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net, Total | $ (1,216,500) | $ (0)
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] |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net, Total | (11,636,120) |
Nonoperating Income (Expense) [Member] | Hot-rolled Coil Steel Contracts [Member] |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net, Total | (11,636,120) | (515,160)
Derivative Instruments Not Designated as Hedging Instruments, Loss |  | $ 515,160
Nonoperating Income (Expense) [Member] | Paycheck Protection Program CARES Act [Member] |  |
Gain (Loss) on Extinguishment of Debt, Total | $ 1,706,614 |

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