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)