Note H - Derivative Financial Instruments - Net Fair Value of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Mar. 31, 2024
Derivative asset	$ 38	$ 74
Derivative liability	10	1,686
Hot-rolled Coil Future Contracts [Member] \| Not Designated as Hedging Instrument [Member] \| Short [Member]
Derivative asset	38	74
Derivative liability	$ 10	$ 1,686

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483466/210-20-50-3

Name:	us-gaap_DerivativeLiabilitiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant