Note H - Derivative Financial Instruments - Gain (Loss) Recognized in Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Pre-tax gain (loss) recognized in OCI	$ 0	$ 8,833
Revenue	137,298	161,803
Total	7,690	11,184
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Revenue	(418)
Total		(626)
Hot-rolled Coil Future Contracts [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Revenue	(418)	(626)
Hot-rolled Coil Future Contracts [Member] | Designated as Hedging Instrument [Member]
Pre-tax gain (loss) recognized in OCI	$ 0	$ 8,833