Note 2 - Acquisition 2 (Details Textual) - Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Comtrafo Industria de Transformadores Eletricos S.A. (Comtrafo) [Member]
Business Combination, Acquisition-Related Cost, Expense	$ 1.2
Megatran [Member]
Business Combination, Acquisition-Related Cost, Expense		$ 1.1

Amount of expense for acquisition-related cost incurred to effect business combination. Includes, but is not limited to, finder's fee; advisory, legal, accounting, valuation, and other professional and consulting fees; and general administrative cost, including cost of maintaining internal acquisition department.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-7

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 25
-Paragraph 23
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479405/805-10-25-23

Name:	us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration