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Note H - Derivative Financial Instruments (Details Textual) | 6 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) T | Mar. 31, 2021 USD ($) | Sep. 30, 2020 USD ($)
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred | $ 26,353,840 |  |
Derivative, Collateral, Right to Reclaim Cash | 4,158,248 |  | $ 12,001,485
Derivative Margin Call Position | 422,877 |  |
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |  |
Reclassification from AOCI, Current Period, Tax, Total | 1,819,688 |  |
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 | 23,467,120 |  |
Open Hedges Subject To Fair Value Changes [Member] |  |  |
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred | $ 2,886,720 |  |
Designated as Hedging Instrument [Member] | Short [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Mass (US Ton) | T | 22,500 |  |
Not Designated as Hedging Instrument [Member] | Short [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Mass (US Ton) | T | 3,440 |  |
Not Designated as Hedging Instrument [Member] | Long [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Mass (US Ton) | T | 9,160 |  |
Other Current Assets [Member] |  |  |
Derivative, Collateral, Right to Reclaim Cash | $ 4,158,248 | $ 12,001,485 |
Commodity Contract [Member] | Accounts Payable and Accrued Liabilities [Member] |  |  |
Hedging Liabilities, Current | 1,049,320 | $ 501,360 |
Nonoperating Income (Expense) [Member] |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | $ (9,930,720) |  |

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