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Note 17 - Business Segments - Operating Results for Business Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Revenues $ 72,358 $ 40,290
Segment other operating expenses (b) [1],[2] 66,714 43,581
Segment operating income 5,644 (3,291)
Operating income (loss): 5,644 (3,291)
Interest income, net 932 1,120
Other income (expense), net 347 (160)
Income (loss) before income tax expense 6,923 (2,331)
Depreciation and amortization 1,229 1,008
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member]    
Revenues 0 0
Segment other operating expenses (b) [1],[2] 0 3,920
Segment operating income 0 (3,920)
Operating income (loss): 0 (3,920)
Grid [Member]    
Revenues 60,087 32,336
Grid [Member] | Operating Segments [Member]    
Revenues 60,087 32,336
Segment other operating expenses (b) [1],[2] 55,932 32,573
Segment operating income 4,155 (237)
Operating income (loss): 4,155 (237)
Depreciation and amortization 1,202 987
Wind [Member]    
Revenues 12,271 7,954
Wind [Member] | Operating Segments [Member]    
Revenues 12,271 7,954
Segment other operating expenses (b) [1],[2] 10,782 7,088
Segment operating income 1,489 866
Operating income (loss): 1,489 866
Depreciation and amortization $ 27 $ 21
[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.