Note 9 - Derivative Financial Instruments - Gain (Loss) Recognized in Earnings for Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Hot-rolled coil steel contracts			$ 1,227	$ 1,640
Hot-rolled Coil Future Contracts [Member] | Designated as Hedging Instrument [Member]
Hot-rolled coil steel contracts	$ 1,381	$ 264		$ 5,833
Hot-rolled Coil Steel Contracts [Member] | Nonoperating Income (Expense) [Member]
Hot-rolled coil steel contracts			$ 2,508