Note 7 - Property, Plant and Equipment (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2025	Mar. 31, 2025
Construction in Progress, Gross	$ 2,346	$ 135
Granite City, IL Facility [Member]
Construction in Progress, Gross	$ 1,900

Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

Name:	us-gaap_ConstructionInProgressGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant