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Note 1 - Nature of the Business and Operations and Liquidity (Details Textual)
$ / shares in Units, $ in Thousands, € in Millions
 1 Months Ended 3 Months Ended
Oct. 26, 2020
USD ($)
$ / shares
shares
Oct. 01, 2020
USD ($)
$ / shares
shares
Sep. 02, 2020
EUR (€)
Dec. 31, 2015
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Sep. 11, 2020
EUR (€)
May 29, 2020
EUR (€)
Retained Earnings (Accumulated Deficit), Ending Balance         $ (1,001,313) $ (978,635)    
Cash, Cash Equivalents, and Marketable Securities         73,000      
Net Cash Provided by (Used in) Operating Activities, Total         (8,681) (16,497)    
Proceeds from Issuance of Common Stock         $ 51,477    
Public Offering [Member]                
Stock Issued During Period, Shares, New Issues (in shares) | shares 3,670,000              
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 15              
Proceeds from Issuance of Common Stock $ 51,500              
Additional Shares to be Issued (in shares) | shares 550,500              
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            
Shares Issued, Price Per Share (in dollars per share) | $ / shares   $ 14.23            
Northeast Power Systems, Inc (NEPSI) [Member] | Restricted Common Stock [Member]                
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares   873,657            
Inox Wind Limited [Member]                
Supply Agreement, Aggregate Value       $ 210,000        
Supply Commitment, Extension Period (Year)       3 years        
Supply Commitment, Default, Letters of Credit to be Received | €             € 4.7 € 6.0
Supply Commitment, Letters of Credit Received | €     € 1.3          
Certificates of Deposit [Member]                
Debt Securities, Available-for-sale, Term (Year)         6 years