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Note 2 - Acquisition (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Aug. 01, 2024
Sep. 30, 2025
Jun. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Mar. 31, 2025
Cost of Revenue   $ 45,423   $ 38,858   $ 93,292 $ 66,923  
Net Income (Loss) Attributable to Parent   4,750 $ 6,724 $ 4,887 $ (2,524) 11,474 $ 2,363  
Megatran [Member]                
Business Combination, Consideration Transferred $ 61,400              
Payments to Acquire Businesses, Gross $ 30,000              
Business Acquisition, Share Price (in dollars per share) $ 24.16              
Business Combination, Acquired Receivable, Fair Value $ 16,100              
Business Combination, Acquired Receivables, Gross Contractual Amount 16,900              
Business Combination, Acquired Receivables, Estimated Uncollectible 800              
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory 700              
Cost of Revenue               $ 700
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 2,000              
Revenues   16,400       34,100    
Net Income (Loss) Attributable to Parent   2,000       4,500    
Amortization of Intangible Assets   $ 100       $ 100    
Megatran [Member] | Backlog [Member]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 700              
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Month) 8 months              
Megatran [Member] | Customer Relationships [Member]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 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 Costs               $ 1,100