Note H - Derivative Financial Instruments - Gain (Loss) Recognized in Other Comprehensive Income (Details) - USD ($)	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Hot-rolled coil steel contracts	$ 8,833,360	$ (32,807,460)
Hot-rolled coil steel contracts	(161,803,090)	(65,916,439)
Costs of products sold	143,131,162	48,586,504
Total	(11,184,374)	(11,311,797)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Hot-rolled coil steel contracts	(626,180)
Costs of products sold		1,582,200
Total		(3,515,820)
Hot-rolled Coil Future Contracts [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Hot-rolled coil steel contracts	(626,180)
Hot-rolled Coil Future Contracts [Member] | Designated as Hedging Instrument [Member]
Hot-rolled coil steel contracts	$ 8,833,360
Hotrolled Coil Futures Contracts 2 [Member]
Hot-rolled coil steel contracts		(32,807,460)
Hotrolled Coil Futures Contracts 2 [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Hot-rolled coil steel contracts		$ (5,098,020)