Note H - Derivative Financial Instruments (Details Textual) $ in Millions	9 Months Ended
	Dec. 31, 2023 USD ($) T	Dec. 31, 2022 USD ($)	Mar. 31, 2023 USD ($)
Derivative Asset	$ 3.0		$ 1.6
Other Current Assets [Member]
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset	4.8		$ 2.4
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Reclassification from AOCI, Current Period, Tax	$ 0.1	$ 0.7
Not Designated as Hedging Instrument [Member] | Short [Member]
Derivative, Nonmonetary Notional Amount, Mass (US Ton) | T	21,140