Note 9 - Derivative Financial Instruments - Net Fair Value of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026
Derivative asset	$ 868	$ 153
Derivative liability	1,851	426
Hot-rolled Coil Future Contracts [Member] \| Not Designated as Hedging Instrument [Member] \| Short [Member]
Derivative asset	868	153
Derivative liability	$ 1,851	$ 426

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 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-10

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