Note H - Derivative Financial Instruments (Details Textual)	9 Months Ended
	Dec. 31, 2022 USD ($) T	Dec. 31, 2021 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 202 USD ($)
Derivative Asset, Total			$ 933,200
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	$ 1,116,700
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset	1,854,978	$ 13,523,416
Other Current Assets [Member]
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset			$ 13,523,416	$ 1,854,978
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Reclassification from AOCI, Current Period, Tax, Total	719,282	$ 2,976,019
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	1,138,800
Open Hedges Subject To Fair Value Changes [Member]
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	$ 22,100
Designated as Hedging Instrument [Member]
Derivative, Nonmonetary Notional Amount, Mass (US Ton) | T	0
Not Designated as Hedging Instrument [Member]
Derivative, Nonmonetary Notional Amount, Mass (US Ton) | T	2,080
Not Designated as Hedging Instrument [Member] | Short [Member]
Derivative, Nonmonetary Notional Amount, Mass (US Ton) | T	35,040