Note H - Derivative Financial Instruments - Net Fair Value of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Mar. 31, 2023
Derivative assets	$ 3,000	$ 1,600
Current Portion of Derivative Assets [Member] | Hot-rolled Coil Future Contracts [Member] | Not Designated as Hedging Instrument [Member] | Short [Member]
Derivative assets	26	536
Current Portion of Derivative Liability [Member] | Hot-rolled Coil Future Contracts [Member] | Not Designated as Hedging Instrument [Member] | Short [Member]
Derivative liabilities	$ 808	$ 2,212