Note H - Derivative Financial Instruments - Gain (Loss) Recognized in Other Comprehensive Income (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Hot-rolled Coil Future Contracts [Member]
Gain recognized in OCI	$ 3,473,300
Hot-rolled coil steel contracts	(14,716,860)
Hot-rolled coil steel contracts	3,473,300
Hot-rolled coil steel contracts	14,716,860
Total	(14,716,860)
Hot-rolled Coil Future Contracts [Member] | Cost of Sales [Member]
Hot-rolled coil steel contracts	49,200
Hot-rolled coil steel contracts	(49,200)
Total	49,200
Hot-rolled Coil Future Contracts [Member] | Designated as Hedging Instrument [Member]
Gain recognized in OCI	3,473,300
Hot-rolled coil steel contracts	3,473,300
Hot-rolled Coil Future Contracts [Member] | Designated as Hedging Instrument [Member] | Sales [Member]
Hot-rolled coil steel contracts	14,766,060		$ 22,950,860	$ (396,720)
Hot-rolled coil steel contracts	(14,766,060)		(22,950,860)	396,720
Total	$ 14,766,060		22,950,860	(396,720)
Hotrolled Coil Futures Contracts 2 [Member]
Gain recognized in OCI		$ 3,364,460	(6,609,540)	3,364,460
Hot-rolled coil steel contracts		396,720	(12,317,960)	396,720
Hot-rolled coil steel contracts		3,364,460	(6,609,540)	3,364,460
Hot-rolled coil steel contracts		(396,720)	12,317,960	(396,720)
Total		396,720	(12,317,960)	396,720
Hotrolled Coil Futures Contracts 2 [Member] | Cost of Sales [Member]
Hot-rolled coil steel contracts			10,632,900
Hot-rolled coil steel contracts			(10,632,900)
Total			10,632,900
Hotrolled Coil Futures Contracts 2 [Member] | Designated as Hedging Instrument [Member]
Gain recognized in OCI		3,364,460	(6,609,540)	3,364,460
Hot-rolled coil steel contracts		3,364,460	$ (6,609,540)	$ 3,364,460
Hotrolled Coil Futures Contracts 2 [Member] | Designated as Hedging Instrument [Member] | Sales [Member]
Hot-rolled coil steel contracts		(396,720)
Hot-rolled coil steel contracts		396,720
Total		$ (396,720)