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Note 20 - Business Segments - Operating Results for Business Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Revenues $ 222,818 $ 145,639
Segment other operating expenses (b) [1],[2] 223,895 157,007
Segment operating income (loss) (1,077) (11,368)
Operating loss: (1,077) (11,368)
Interest income, net 3,708 1,302
Other expense (265) (736)
Income (loss) before taxes 2,366 (10,802)
Depreciation and Amortization 5,560 4,495
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member]    
Revenues 0 0
Segment other operating expenses (b) [1],[2] 6,681 4,908
Segment operating income (loss) (6,681) (4,908)
Operating loss: (6,681) (4,908)
Grid [Member]    
Revenues 187,170 122,065
Grid [Member] | Operating Segments [Member]    
Revenues 187,170 122,065
Segment other operating expenses (b) [1],[2] 185,358 128,974
Segment operating income (loss) 1,812 (6,909)
Operating loss: 1,812 (6,909)
Depreciation and Amortization 5,468 4,408
Wind [Member]    
Revenues 35,648 23,574
Wind [Member] | Operating Segments [Member]    
Revenues 35,648 23,574
Segment other operating expenses (b) [1],[2] 31,856 23,125
Segment operating income (loss) 3,792 449
Operating loss: 3,792 449
Depreciation and Amortization $ 92 $ 87
[1] Segment other operating expense includes cost of sales, research and development expense, selling general, and administrative expense, amortization of acquisition related intangibles, and gain/loss on contingent consideration.
[2] The significant expense categories and amounts align with the segment-level information that is regularly provided to the chief operating decision maker.