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Note 2 - Acquisition (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 05, 2025
Aug. 01, 2024
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2025
Dec. 31, 2024
Mar. 31, 2025
Cost of Revenue     $ 51,677     $ 45,077     $ 144,970 $ 112,000  
Net Income (Loss) Attributable to Parent     117,806 $ 4,750 $ 6,724 2,465 $ 4,887 $ (2,524) 129,280 4,828  
Backlog [Member]                      
Amortization of Intangible Assets     100     $ 300     100 $ 400  
Comtrafo Industria de Transformadores Eletricos S.A. (Comtrafo) [Member]                      
Business Combination, Consideration Transferred $ 202,700                    
Payments to Acquire Businesses, Gross $ 88,300                    
Business Combination, Price Per Share (in dollars per share) $ 32.47                    
Business Combination, Acquired Receivable, Purchased without Credit Deterioration, Fair Value $ 4,100                    
Business Combination, Acquired Receivable, Purchased without Credit Deterioration, Gross Contractual Amount 8,500                    
Business Combination, Acquired Receivable, Purchased without Credit Deterioration, Contractual Cash Flow, Estimated Uncollectible 4,400                    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory 1,500                    
Cost of Revenue     400           400    
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived 9,500                    
Business Combination, Recognized Asset Acquired, Deferred Tax Asset 4,100                    
Revenues     4,600           4,600    
Net Income (Loss) Attributable to Parent     900           900    
Amortization of Intangible Assets     200                
Comtrafo Industria de Transformadores Eletricos S.A. (Comtrafo) [Member] | Backlog [Member]                      
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived $ 1,800                    
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Month) 16 months                    
Comtrafo Industria de Transformadores Eletricos S.A. (Comtrafo) [Member] | Customer Relationships [Member]                      
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived $ 7,700                    
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Month) 5 years                    
Comtrafo Industria de Transformadores Eletricos S.A. (Comtrafo) [Member] | Selling, General and Administrative Expenses [Member]                      
Business Combination, Acquisition-Related Cost, Expense     1,200           1,200    
Comtrafo Industria de Transformadores Eletricos S.A. (Comtrafo) [Member] | Cost of Sales [Member]                      
Business Combination, Acquisition-Related Cost, Expense     100           100    
Megatran [Member]                      
Business Combination, Consideration Transferred   $ 61,400                  
Payments to Acquire Businesses, Gross   $ 30,000                  
Business Combination, Price Per Share (in dollars per share)   $ 24.16                  
Business Combination, Acquired Receivable, Purchased without Credit Deterioration, Fair Value   $ 16,100                  
Business Combination, Acquired Receivable, Purchased without Credit Deterioration, Gross Contractual Amount   16,900                  
Business Combination, Acquired Receivable, Purchased without Credit Deterioration, Contractual Cash Flow, Estimated Uncollectible   800                  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory   700                  
Cost of Revenue                     $ 700
Revenues     14,100           48,300    
Net Income (Loss) Attributable to Parent     600           3,900    
Amortization of Intangible Assets     $ 100           $ 100    
Megatran [Member] | Backlog [Member]                      
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived   $ 700                  
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Month)   8 months                  
Megatran [Member] | Customer Relationships [Member]                      
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived   $ 1,300                  
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Month)   10 years                  
Megatran [Member] | Selling, General and Administrative Expenses [Member]                      
Business Combination, Acquisition-Related Cost, Expense                     $ 1,100