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Note 17 - Business Segments - Operating Results for Business Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenues $ 65,862 $ 54,471 $ 138,220 $ 94,761
Segment other operating expenses 62,897 [1],[2] 55,224 [3],[4] 129,610 [1],[2] 98,804 [3],[4]
Segment operating income 2,965 [2] (753) [4] 8,610 [2] (4,043) [4]
Operating income (loss): 2,965 [2] (753) [4] 8,610 [2] (4,043) [4]
Interest income, net 2,269 979 3,201 2,099
Other expense, net (367) (329) (21) (489)
Income (loss) before income tax expense (benefit) 4,867 (103) 11,790 (2,433)
Depreciation and amortization 1,297 1,387 2,525 2,395
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member]        
Revenues 0 0 0 0
Segment other operating expenses 0 [1],[2] 2,762 [3],[4] 0 [1],[2] 6,682 [3],[4]
Segment operating income 0 [2] (2,762) [4] 0 [2] (6,682) [4]
Operating income (loss): 0 [2] (2,762) [4] 0 [2] (6,682) [4]
Grid [Member]        
Revenues 54,342 46,936 114,429 79,272
Grid [Member] | Operating Segments [Member]        
Revenues 54,342 46,936 114,429 79,272
Segment other operating expenses 53,064 [1],[2] 45,366 [3],[4] 108,994 [1],[2] 77,939 [3],[4]
Segment operating income 1,278 [2] 1,570 [4] 5,435 [2] 1,333 [4]
Operating income (loss): 1,278 [2] 1,570 [4] 5,435 [2] 1,333 [4]
Depreciation and amortization 1,266 1,376 2,468 2,363
Wind [Member]        
Revenues 11,520 7,535 23,791 15,489
Wind [Member] | Operating Segments [Member]        
Revenues 11,520 7,535 23,791 15,489
Segment other operating expenses 9,833 [1],[2] 7,096 [3],[4] 20,616 [1],[2] 14,183 [3],[4]
Segment operating income 1,687 [2] 439 [4] 3,175 [2] 1,306 [4]
Operating income (loss): 1,687 [2] 439 [4] 3,175 [2] 1,306 [4]
Depreciation and amortization $ 31 $ 11 $ 57 $ 32
[1] Segment other operating expense includes cost of sales, research and development expense, selling general, and administrative expense, and amortization of acquisition related intangibles.
[2] The significant expense categories and amounts align with the segment-level information that is regularly provided to the chief operating decision maker.
[3] 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.
[4] The significant expense categories and amounts align with the segment-level information that is regularly provided to the chief operating decision maker.