Note H - Derivative Financial Instruments - Net Fair Value of Derivative Financial Instruments (Details) - USD ($)	Jun. 30, 2022	Mar. 31, 2022
Hot-rolled coil steel contracts hedging sales	$ 330,200	$ 933,200
Designated as Hedging Instrument [Member] | Hot-rolled Coil Future Contracts [Member] | Other Current Assets [Member]
Hot-rolled coil steel contracts hedging sales		4,240,740
Designated as Hedging Instrument [Member] | Hot-rolled Coil Future Contracts [Member] | Short [Member] | Other Current Assets [Member]
Hot-rolled coil steel contracts hedging sales	1,333,860
Designated as Hedging Instrument [Member] | Hot-rolled Coil Future Contracts [Member] | Short [Member] | Current Portion of Derivative Liability [Member]
Derivative liabilities		8,905,500
Not Designated as Hedging Instrument [Member] | Hot-rolled Coil Future Contracts [Member] | Short [Member] | Other Current Assets [Member]
Hot-rolled coil steel contracts hedging sales	2,146,860
Not Designated as Hedging Instrument [Member] | Hot-rolled Coil Future Contracts [Member] | Short [Member] | Current Portion of Derivative Liability [Member]
Derivative liabilities	$ 2,675,400	$ 5,524,020