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Note 2 - Acquisitions (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
May 06, 2021
Mar. 31, 2021
Oct. 01, 2020
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Payments to Acquire Businesses, Gross           $ (0) $ 11,479            
Cost of Revenue, Total       $ 25,710 $ 24,647 46,169 46,698            
Business Combination, Contingent Consideration, Liability, Total   $ 7,100   $ 1,100 $ 4,700 $ 1,100 $ 4,700 $ 2,600 $ 7,100   $ 1,400 $ 1,200 $ 7,200
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                    
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   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