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Note H - Derivative Financial Instruments (Details Textual) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) g T | Dec. 31, 2020 USD ($) | Mar. 31, 2021 USD ($)
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred |  |  | $ 9,220,880 |  |
Derivative, Collateral, Right to Reclaim Cash | $ 1,585,350 | $ 12,001,485 | 1,585,350 | $ 12,001,485 |
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |  |  |  |
Reclassification from AOCI, Current Period, Tax, Total | 2,976,019 | $ 83,311 | 2,976,019 | $ 83,311 |
Closed Hedges with Hedged Transaction Still Expected to Occur [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred |  |  | 9,952,400 |  |
Open Hedges Subject To Fair Value Changes [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred |  |  | $ 731,520 |  |
Designated as Hedging Instrument [Member] | Short [Member] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass (Gram) | g |  |  | 34,020 |  |
Not Designated as Hedging Instrument [Member] | Short [Member] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass (Gram) | g |  |  | 21,380 |  |
Not Designated as Hedging Instrument [Member] | Long [Member] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass (Gram) | T |  |  | 16,860 |  |
Other Current Assets [Member] |  |  |  |  |
Derivative, Collateral, Right to Reclaim Cash | 1,585,350 |  | $ 1,585,350 |  | $ 12,001,485
Commodity Contract [Member] | Accounts Payable and Accrued Liabilities [Member] |  |  |  |  |
Hedging Liabilities, Current | $ 280,220 |  | 280,220 |  | $ 501,360
Nonoperating Income (Expense) [Member] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total |  |  | $ (9,930,720) |  |

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