Note H - Derivative Financial Instruments - Net Fair Value of Derivative Financial Instruments (Details) - USD ($)	Dec. 31, 2022	Mar. 31, 2022
Derivative assets		$ 933,200
Designated as Hedging Instrument [Member] | Hot-rolled Coil Future Contracts [Member] | Current Portion of Derivative Liability [Member]
Derivative assets		4,240,740
Designated as Hedging Instrument [Member] | Hot-rolled Coil Future Contracts [Member] | Short [Member]
Derivative assets	$ 22,100
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] | Current Portion of Derivative Liability [Member]
Derivative liabilities	649,700	$ 5,524,020
Not Designated as Hedging Instrument [Member] | Hot-rolled Coil Future Contracts [Member] | Short [Member] | Current Portion of Derivative Assets [Member]
Derivative assets	$ 786,720