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Note 5 - Goodwill - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Balance	$ 34,634
Balance	43,471	$ 34,634
Grid [Member]
Balance	34,634	1,719
Balance	43,471	34,634
Grid [Member] | NEPSI [Member]
Acquisition		$ 32,915
Grid [Member] | Neeltran [Member]
Acquisition	$ 8,837

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-Paragraph 1
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-Section S99
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X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
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