Note H - Derivative Financial Instruments (Details Textual)	3 Months Ended
	Jun. 30, 2022 USD ($) T	Jun. 30, 2021 USD ($)	Mar. 31, 2022 USD ($)
Derivative Asset, Total	$ 330,200		$ 933,200
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	4,080,160
Other Current Assets [Member]
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset	1,320,670		$ 13,523,416
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Reclassification from AOCI, Current Period, Tax, Total	151,285	$ 849,422
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	5,745,540
Open Hedges Subject To Fair Value Changes [Member]
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	$ 1,665,380
Designated as Hedging Instrument [Member] | Short [Member]
Derivative, Nonmonetary Notional Amount, Mass (US Ton) | T	9,980
Not Designated as Hedging Instrument [Member] | Short [Member]
Derivative, Nonmonetary Notional Amount, Mass (US Ton) | T	18,800
Not Designated as Hedging Instrument [Member] | Long [Member]
Derivative, Nonmonetary Notional Amount, Mass (US Ton) | T	6,980