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

Note F - Property, Plant and Equipment (Details Textual) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Mar. 31, 2024
Construction in Progress, Gross		$ 665		$ 665		$ 1,977
Gain (Loss) on Disposition of Property Plant Equipment		$ 375	$ 0	$ 153	$ 0
Upgrade of Decatur, AL Processing Line [Member]
Construction in Progress, Gross	$ 800
Gain (Loss) on Disposition of Property Plant Equipment	$ (400)