Note H - Derivative Financial Instruments - Gain (Loss) Recognized in Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2023	Dec. 31, 2022
Pre-tax gain (loss) recognized in OCI	$ 0			$ 22			$ 0	$ 9,446
Revenue	115,973			111,860			384,019	423,356
Total	1,184	$ 3,513	$ 7,690	1,376	$ 2,471	$ 11,184	12,387	15,031
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Total	0			(861)			(418)	(2,977)
Hot-rolled Coil Future Contracts [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Revenue	0			(861)			(418)	(2,977)
Hot-rolled Coil Future Contracts [Member] | Designated as Hedging Instrument [Member]
Pre-tax gain (loss) recognized in OCI	$ 0			$ 22			$ 0	$ 9,446