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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
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2022
Jun. 30, 2022
Sep. 30, 2021
Jun. 30, 2021
Payments to Acquire Businesses, Gross           $ (0) $ 11,479              
Cost of Revenue, Total       $ 23,364 $ 23,227 69,533 69,925              
Business Combination, Contingent Consideration, Liability, Total   $ 7,100   $ 900 $ 2,600 $ 900 $ 2,600 $ 1,200 $ 7,100   $ 1,100 $ 1,400 $ 4,700 $ 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)   873,657 873,657                      
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