Note H - Derivative Financial Instruments - Net Fair Value of Derivative Financial Instruments (Details) - USD ($)	Sep. 30, 2022	Mar. 31, 2022
Derivative assets	$ 743,380	$ 933,200
Current Portion of Derivative Assets [Member] | Hot-rolled Coil Future Contracts [Member] | Not Designated as Hedging Instrument [Member] | Short [Member]
Derivative assets	2,958,720
Current Portion of Derivative Liability [Member] | Hot-rolled Coil Future Contracts [Member] | Not Designated as Hedging Instrument [Member] | Short [Member]
Derivative liabilities	$ 3,102,160	5,524,020
Current Portion of Derivative Liability [Member] | Hot-rolled Coil Future Contracts [Member] | Designated as Hedging Instrument [Member]
Derivative assets		4,240,740
Current Portion of Derivative Liability [Member] | Hot-rolled Coil Future Contracts [Member] | Designated as Hedging Instrument [Member] | Short [Member]
Derivative liabilities		$ 8,905,500