Note 7 - Property, Plant and Equipment (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026
Construction in Progress, Gross	$ 2,738	$ 934
Sinton, TX Facility Expansion [Member]
Construction in Progress, Gross	$ 1,800

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://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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