Note H - Derivative Financial Instruments - Net Fair Value of Derivative Financial Instruments (Details) - Hot-rolled Coil Future Contracts [Member] - USD ($)	Dec. 31, 2021	Mar. 31, 2021
Designated as Hedging Instrument [Member] | Short [Member] | Other Current Assets [Member]
Hot-rolled coil steel contracts hedging sales	$ 3,539,300	$ 91,760
Designated as Hedging Instrument [Member] | Short [Member] | Current Portion of Derivative Liability [Member]
Derivative liabilities	2,342,780	7,890,700
Designated as Hedging Instrument [Member] | Short [Member] | Other Noncurrent Liabilities [Member]
Derivative liabilities		50,420
Designated as Hedging Instrument [Member] | Long [Member] | Other Current Assets [Member]
Hot-rolled coil steel contracts hedging sales		530,640
Not Designated as Hedging Instrument [Member] | Short [Member] | Other Current Assets [Member]
Hot-rolled coil steel contracts hedging sales	1,869,080
Not Designated as Hedging Instrument [Member] | Short [Member] | Current Portion of Derivative Liability [Member]
Derivative liabilities	$ 634,360	$ 88,680