Note H - Derivative Financial Instruments - Gain (Loss) Recognized in Other Comprehensive Income (Details) - USD ($)	3 Months Ended	6 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
Hot-rolled Coil Future Contracts [Member]
Gain recognized in OCI	$ 1,557,820
Hot-rolled coil steel contracts		$ 5,914,720
Hot-rolled coil steel contracts	1,557,820
Hot-rolled coil steel contracts		(5,914,720)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		5,914,720
Hot-rolled Coil Future Contracts [Member] | Cost of Sales [Member]
Hot-rolled coil steel contracts		9,001,500
Hot-rolled coil steel contracts		(9,001,500)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		9,001,500
Hot-rolled Coil Future Contracts [Member] | Designated as Hedging Instrument [Member]
Gain recognized in OCI	1,557,820
Hot-rolled coil steel contracts	1,557,820
Hot-rolled Coil Future Contracts [Member] | Designated as Hedging Instrument [Member] | Sales [Member]
Hot-rolled coil steel contracts		3,086,780
Hot-rolled coil steel contracts		(3,086,780)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		3,086,780
Hotrolled Coil Futures Contracts 2 [Member]
Gain recognized in OCI	(20,013,560)
Hot-rolled coil steel contracts		2,398,900
Hot-rolled coil steel contracts	(20,013,560)
Hot-rolled coil steel contracts		(2,398,900)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		2,398,900
Hotrolled Coil Futures Contracts 2 [Member] | Cost of Sales [Member]
Hot-rolled coil steel contracts		10,583,700
Hot-rolled coil steel contracts		(10,583,700)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		10,583,700
Hotrolled Coil Futures Contracts 2 [Member] | Designated as Hedging Instrument [Member]
Gain recognized in OCI	(20,013,560)
Hot-rolled coil steel contracts	$ (20,013,560)
Hotrolled Coil Futures Contracts 2 [Member] | Designated as Hedging Instrument [Member] | Sales [Member]
Hot-rolled coil steel contracts		8,184,800
Hot-rolled coil steel contracts		(8,184,800)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		$ 8,184,800