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Note 2 - NEPSI Acquisitions (Details Textual)
$ / shares in Units, $ in Thousands
3 Months Ended 7 Months Ended 9 Months Ended 12 Months Ended
Oct. 01, 2020
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Oct. 26, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Payments to Acquire Businesses, Gross       $ 26,000    
Business Combination, Contingent Consideration, Liability, Total $ 4,000 $ 6,700     $ 6,700    
Finite-Lived Intangible Asset, Useful Life (Year)            
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability   2,740 $ 2,740  
Amortization of Intangible Assets, Total   400 $ 100   $ 600 $ 300  
Backlog [Member]              
Finite-Lived Intangible Asset, Useful Life (Year)         2 years    
Customer Relationships [Member]              
Finite-Lived Intangible Asset, Useful Life (Year)         7 years    
Northeast Power Systems, Inc (NEPSI) [Member]              
Payments to Acquire Businesses, Gross $ 26,000            
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            
Business Combination, Consideration Transferred, Total $ 42,400            
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, Inventory 4,200 1,000     $ 1,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 7,300            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities 1,700            
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability   2,700     2,700    
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual   6,600     6,600    
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual   100     100    
Amortization of Intangible Assets, Total   500     500    
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            
Northeast Power Systems, Inc (NEPSI) [Member] | Trademarks and Trade Names [Member]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 600            
Northeast Power Systems, Inc (NEPSI) [Member] | Trademarks and Trade Names [Member] | Royalty Rate [Member]              
Intangible Assets, Measurement Input 0.08            
Northeast Power Systems, Inc (NEPSI) [Member] | Trademarks and Trade Names [Member] | Measurement Input, Discount Rate [Member]              
Intangible Assets, Measurement Input 0.13            
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] | Selling, General and Administrative Expenses [Member]              
Business Combination, Acquisition Related Costs   $ 300     $ 300    
Northeast Power Systems, Inc (NEPSI) [Member]              
Payments to Suppliers             $ 400