Note G - Derivative Financial Instruments (Details Textual) $ in Thousands	3 Months Ended
	Jun. 30, 2024 USD ($) GT	Jun. 30, 2023 USD ($)	Mar. 31, 2024 USD ($)
Other Current Assets [Member]
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset | $	$ 0		$ 3,000
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Reclassification from AOCI, Current Period, Tax | $		$ 100
Not Designated as Hedging Instrument [Member] | Short [Member]
Derivative, Nonmonetary Notional Amount, Mass (Gigaton) | GT	280
Not Designated as Hedging Instrument [Member] | Long [Member]
Derivative, Nonmonetary Notional Amount, Mass (Gigaton) | GT	220