Note H - Derivative Financial Instruments (Details Textual) $ in Millions	9 Months Ended
	Dec. 31, 2024 USD ($) T	Dec. 31, 2023 USD ($)	Mar. 31, 2024 USD ($)
Other Current Assets [Member]
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset | $	$ 0.1		$ 3.0
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Reclassification from AOCI, Current Period, Tax | $		$ 0.1
Not Designated as Hedging Instrument [Member] | Long [Member]
Derivative, Nonmonetary Notional Amount, Mass (US Ton) | T	4,020
Not Designated as Hedging Instrument [Member] | Short [Member]
Derivative, Nonmonetary Notional Amount, Mass (US Ton) | T	180