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Note 2 - Acquisitions (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
May 06, 2021
Mar. 31, 2021
Oct. 01, 2020
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2022
Sep. 30, 2021
Payments to Acquire Businesses, Gross       $ (0) $ 11,479          
Cost of Revenue, Total       20,458 22,051          
Business Combination, Contingent Consideration, Liability, Total   $ 7,100   $ 1,400 $ 7,200 $ 2,600 $ 7,100   $ 1,200 $ 4,700
Northeast Power Systems, Inc (NEPSI) [Member]                    
Payments to Suppliers               $ 400    
Backlog [Member]                    
Finite-Lived Intangible Asset, Useful Life (Year)       2 years            
Customer Relationships [Member]                    
Finite-Lived Intangible Asset, Useful Life (Year)       7 years            
Neeltran Inc. [Member]                    
Payments to Acquire Businesses, Gross $ 4,400                  
Business Combination, Consideration Transferred, Total 16,400                  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory           600        
Cost of Revenue, Total           $ 600        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities                 2,300  
Neeltran Inc. [Member] | Trademarks and Trade Names [Member]                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets $ 1,200               1,200  
Neeltran Inc. [Member] | Trademarks and Trade Names [Member] | Royalty Rate [Member]                    
Intangible Assets, Measurement Input (Rate) 1.00%                  
Neeltran Inc. [Member] | Trademarks and Trade Names [Member] | Measurement Input, Discount Rate [Member]                    
Intangible Assets, Measurement Input (Rate) 24.50%                  
Neeltran Inc. [Member] | Trademarks and Trade Names [Member] | Measurement Input, Expected Term [Member]                    
Intangible Assets, Measurement Input (Rate) 0.15%                  
Neeltran Inc. [Member] | Backlog [Member]                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 100               100  
Finite-Lived Intangible Asset, Useful Life (Year) 2 years                  
Neeltran Inc. [Member] | Customer Relationships [Member]                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 3,500               $ 3,500  
Finite-Lived Intangible Asset, Useful Life (Year) 7 years                  
Northeast Power Systems, Inc (NEPSI) [Member]                    
Payments to Acquire Businesses, Gross   $ 26,000 $ 26,000              
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)   873,657 873,657              
Business Combination, Consideration Transferred, Total   $ 42,400 $ 42,400              
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High, Number of Shares (in shares)     1,000,000 1,000,000            
Shares Issued, Price Per Share (in dollars per share)     $ 14.23              
Business Combination, Contingent Consideration, Liability, Total     $ 4,000              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities   1,700 1,700       1,700      
Northeast Power Systems, Inc (NEPSI) [Member] | Fair Value Adjustment to Inventory [Member]                    
Cost of Revenue, Total             1,000      
Northeast Power Systems, Inc (NEPSI) [Member] | Selling, General and Administrative Expenses [Member]                    
Business Combination, Acquisition Related Costs             300      
Northeast Power Systems, Inc (NEPSI) [Member] | Trademarks and Trade Names [Member]                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets     $ 600              
Northeast Power Systems, Inc (NEPSI) [Member] | Trademarks and Trade Names [Member] | Royalty Rate [Member]                    
Intangible Assets, Measurement Input (Rate)     8.00%              
Northeast Power Systems, Inc (NEPSI) [Member] | Trademarks and Trade Names [Member] | Measurement Input, Discount Rate [Member]                    
Intangible Assets, Measurement Input (Rate)     13.00%              
Northeast Power Systems, Inc (NEPSI) [Member] | Trademarks and Trade Names [Member] | Measurement Input, Expected Term [Member]                    
Intangible Assets, Measurement Input (Rate)     0.08%              
Northeast Power Systems, Inc (NEPSI) [Member] | Backlog [Member]                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   600 $ 600       600      
Finite-Lived Intangible Asset, Useful Life (Year)     2 years              
Northeast Power Systems, Inc (NEPSI) [Member] | Customer Relationships [Member]                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   $ 6,100 $ 6,100       $ 6,100      
Neeltran Third Party Lenders [Member] | Neeltran Inc. [Member]                    
Payments to Acquire Businesses, Gross $ 7,600                  
Neeltran Third Party Lenders [Member] | Neeltran Inc. [Member] | Indebtedness Secured by Mortgage on Real Property [Member]                    
Payments to Acquire Businesses, Gross 1,900                  
Neeltran Inc. Sellling Stockholders [Member] | Neeltran Inc. [Member]                    
Payments to Acquire Businesses, Gross $ 1,000                  
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) 301,556                  
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 1                  
Capanna, Sr. and Capanna, Jr. [Member] | Neeltran Inc. [Member]                    
Payments to Acquire Businesses, Gross $ 1,100                  
AMSC Husky LLC [Member]                    
Payments to Acquire Real Estate, Total 4,300                  
AMSC Husky LLC [Member] | Owners of Neeltran Headquarters [Member]                    
Payments to Acquire Real Estate, Total $ 2,400