Note H - Derivative Financial Instruments - Net Fair Value of Derivative Financial Instruments (Details) - Hot-rolled Coil Future Contracts [Member] - USD ($)	Sep. 30, 2021	Mar. 31, 2021
Designated as Hedging Instrument [Member] | Long [Member] | Other Current Assets [Member]
Hot-rolled coil steel contracts		$ 530,640
Designated as Hedging Instrument [Member] | Short [Member] | Other Current Assets [Member]
Hot-rolled coil steel contracts		91,760
Designated as Hedging Instrument [Member] | Short [Member] | Current Portion of Derivative Liability [Member]
Derivative liabilities		7,890,700
Designated as Hedging Instrument [Member] | Short [Member] | Other Noncurrent Liabilities [Member]
Derivative liabilities		50,420
Not Designated as Hedging Instrument [Member] | Short [Member] | Other Current Assets [Member]
Hot-rolled coil steel contracts	$ 550,240
Not Designated as Hedging Instrument [Member] | Short [Member] | Current Portion of Derivative Liability [Member]
Derivative liabilities	$ 51,320	$ 88,680