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Note 3 - Acquisitions (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
May 06, 2021
Oct. 01, 2020
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Payments to Acquire Businesses, Gross           $ 11,479,000 $ 26,000,000    
Cost of Revenue, Total     $ 94,943,000 $ 69,671,000          
Business Combination, Contingent Consideration, Liability, Total   $ 4,000.0   $ 7,100     7,100   $ 6,700
Northeast Power Systems, Inc (NEPSI) [Member]                  
Payments to Suppliers               $ 400,000  
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 $ 4,300,000                
Neeltran Inc. [Member]                  
Payments to Acquire Businesses, Gross 4,400,000                
Business Combination, Consideration Transferred, Total 16,400,000                
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory         $ 600,000        
Cost of Revenue, Total         $ 600,000        
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual           $ 21,400,000      
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual           $ 3,400,000      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities 2,300,000                
Neeltran Inc. [Member] | Trademarks and Trade Names [Member]                  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets $ 1,200,000                
Neeltran Inc. [Member] | Trademarks and Trade Names [Member] | Royalty Rate [Member]                  
Intangible Assets, Measurement Input 1.00%                
Neeltran Inc. [Member] | Trademarks and Trade Names [Member] | Measurement Input, Discount Rate [Member]                  
Intangible Assets, Measurement Input 24.50%                
Neeltran Inc. [Member] | Trademarks and Trade Names [Member] | Measurement Input, Expected Term [Member]                  
Intangible Assets, Measurement Input 1500.00%                
Neeltran Inc. [Member] | Backlog [Member]                  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 100,000                
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 $ 3,500,000                
Finite-Lived Intangible Asset, Useful Life (Year) 7 years                
Northeast Power Systems, Inc (NEPSI) [Member]                  
Payments to Acquire Businesses, Gross   26,000,000.0              
Business Combination, Consideration Transferred, Total   $ 42,400,000              
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)   873,657              
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High, Number of Shares (in shares)   1,000,000              
Shares Issued, Price Per Share (in dollars per share)   $ 14.23              
Business Combination, Contingent Consideration, Liability, Total   $ 4,000,000.0              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities   1,700,000              
Northeast Power Systems, Inc (NEPSI) [Member] | Fair Value Adjustment to Inventory [Member]                  
Cost of Revenue, Total             1,000,000.0    
Northeast Power Systems, Inc (NEPSI) [Member] | Selling, General and Administrative Expenses [Member]                  
Business Combination, Acquisition Related Costs             $ 300,000    
Northeast Power Systems, Inc (NEPSI) [Member] | Trademarks and Trade Names [Member]                  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets   $ 600,000              
Northeast Power Systems, Inc (NEPSI) [Member] | Trademarks and Trade Names [Member] | Royalty Rate [Member]                  
Intangible Assets, Measurement Input   8.00%              
Northeast Power Systems, Inc (NEPSI) [Member] | Trademarks and Trade Names [Member] | Measurement Input, Discount Rate [Member]                  
Intangible Assets, Measurement Input   13.00%              
Northeast Power Systems, Inc (NEPSI) [Member] | Trademarks and Trade Names [Member] | Measurement Input, Expected Term [Member]                  
Intangible Assets, Measurement Input   800.00%              
Northeast Power Systems, Inc (NEPSI) [Member] | Backlog [Member]                  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   $ 600,000              
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   $ 6,100,000              
Neeltran Inc. Sellling Stockholders [Member] | Neeltran Inc. [Member]                  
Payments to Acquire Businesses, Gross $ 1,000,000.0                
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) 301,556                
Capanna, Sr. and Capanna, Jr. [Member] | Neeltran Inc. [Member]                  
Payments to Acquire Businesses, Gross $ 1,100,000                
Neeltran Third Party Lenders [Member] | Neeltran Inc. [Member]                  
Payments to Acquire Businesses, Gross 7,600,000                
Neeltran Third Party Lenders [Member] | Neeltran Inc. [Member] | Indebtedness Secured by Mortgage on Real Property [Member]                  
Payments to Acquire Businesses, Gross 1,900,000                
Owners of Neeltran Headquarters [Member] | AMSC Husky LLC [Member]                  
Payments to Acquire Real Estate, Total 2,400,000                
TD Bank [Member] | AMSC Husky LLC [Member]                  
Payments to Acquire Real Estate, Total $ 1,900,000