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Note 5 - Goodwill and Other Intangibles - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
March 31, 2021	$ 43,471
Less impairment loss	0	$ 0
March 31, 2022	43,471	43,471
Grid [Member]
March 31, 2021	43,471	34,634
Neeltran Acquisition		8,837
Less impairment loss	0
March 31, 2022	$ 43,471	$ 43,471

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.

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