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Note 18 - Business Segments - Operating Results for Business Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Revenues $ 74,529 $ 61,403 $ 212,749 $ 156,163
Segment other operating expenses 71,170 [1],[2] 60,088 [3],[4] 200,782 [1],[2] 158,893 [3],[4]
Segment operating income 3,359 [2] 1,315 [4] 11,967 [2] (2,730) [4]
Operating income (loss): 3,359 [2] 1,315 [4] 11,967 [2] (2,730) [4]
Interest income, net 1,997 802 5,198 2,901
Other (expense)/income, net 77 272 57 (214)
Income (loss) before income tax benefit 5,433 2,389 17,222 (43)
Depreciation and amortization 1,789 1,589 4,184 3,984
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member]        
Revenues 0 0 0 0
Segment other operating expenses 0 [1],[2] 0 [3],[4] 0 [1],[2] 6,689 [3],[4]
Segment operating income 0 [2] 0 [4] 0 [2] (6,689) [4]
Operating income (loss): 0 [2] 0 [4] 0 [2] (6,689) [4]
Grid [Member]        
Revenues 63,187 52,306 177,616 131,578
Grid [Member] | Operating Segments [Member]        
Revenues 63,187 52,306 177,616 131,578
Segment other operating expenses 61,156 [1],[2] 52,072 [3],[4] 170,152 [1],[2] 130,006 [3],[4]
Segment operating income 2,031 [2] 234 [4] 7,464 [2] 1,572 [4]
Operating income (loss): 2,031 [2] 234 [4] 7,464 [2] 1,572 [4]
Depreciation and amortization 1,726 1,567 4,089 3,920
Wind [Member]        
Revenues 11,342 9,097 35,133 24,585
Wind [Member] | Operating Segments [Member]        
Revenues 11,342 9,097 35,133 24,585
Segment other operating expenses 10,014 [1],[2] 8,016 [3],[4] 30,630 [1],[2] 22,198 [3],[4]
Segment operating income 1,328 [2] 1,081 [4] 4,503 [2] 2,387 [4]
Operating income (loss): 1,328 [2] 1,081 [4] 4,503 [2] 2,387 [4]
Depreciation and amortization $ 63 $ 22 $ 95 $ 64
[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.