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Note 2 - Acquisitions (Details Textual)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
May 06, 2021
USD ($)
shares
Oct. 01, 2020
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Payments to Acquire Businesses, Gross         $ 11,479 $ (0)        
Cost of Revenue, Total     $ 24,647 $ 15,596 46,698 $ 31,768        
Business Combination, Contingent Consideration, Liability, Total   $ 4,000 $ 4,700   $ 4,700   $ 7,100   $ 7,200 $ 6,700
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          
AMSC Husky LLC [Member]                    
Payments to Acquire Real Estate, Total $ 4,300                  
Owners of Neeltran Headquarters [Member] | AMSC Husky LLC [Member]                    
Payments to Acquire Real Estate, Total 2,400                  
TD Bank [Member] | AMSC Husky LLC [Member]                    
Payments to Acquire Real Estate, Total 1,900                  
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, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual         12,500          
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual         $ (400)          
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                  
Neeltran Inc. [Member] | Trademarks and Trade Names [Member] | Royalty Rate [Member]                    
Intangible Assets, Measurement Input 1                  
Neeltran Inc. [Member] | Trademarks and Trade Names [Member] | Measurement Input, Discount Rate [Member]                    
Intangible Assets, Measurement Input 24.5                  
Neeltran Inc. [Member] | Trademarks and Trade Names [Member] | Measurement Input, Expected Term [Member]                    
Intangible Assets, Measurement Input 15                  
Neeltran Inc. [Member] | Backlog [Member]                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 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                  
Finite-Lived Intangible Asset, Useful Life (Year) 7 years                  
Neeltran Inc. [Member] | Neeltran Inc. Sellling Stockholders [Member]                    
Payments to Acquire Businesses, Gross $ 1,000                  
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares 301,556                  
Neeltran Inc. [Member] | Capanna, Sr. and Capanna, Jr. [Member]                    
Payments to Acquire Businesses, Gross $ 1,100                  
Neeltran Inc. [Member] | Neeltran Third Party Lenders [Member]                    
Payments to Acquire Businesses, Gross 7,600                  
Neeltran Inc. [Member] | Neeltran Third Party Lenders [Member] | Indebtedness Secured by Mortgage on Real Property [Member]                    
Payments to Acquire Businesses, Gross $ 1,900                  
Northeast Power Systems, Inc (NEPSI) [Member]                    
Payments to Acquire Businesses, Gross   26,000                
Business Combination, Consideration Transferred, Total   $ 42,400                
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares   873,657                
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High, Number of Shares (in shares) | shares   1,000,000 1,000,000   1,000,000          
Shares Issued, Price Per Share (in dollars per share) | $ / shares   $ 14.23                
Business Combination, Contingent Consideration, Liability, Total   $ 4,000                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities   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   8                
Northeast Power Systems, Inc (NEPSI) [Member] | Trademarks and Trade Names [Member] | Measurement Input, Discount Rate [Member]                    
Intangible Assets, Measurement Input   13                
Northeast Power Systems, Inc (NEPSI) [Member] | Trademarks and Trade Names [Member] | Measurement Input, Expected Term [Member]                    
Intangible Assets, Measurement Input   8                
Northeast Power Systems, Inc (NEPSI) [Member] | Backlog [Member]                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   $ 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