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Note 1 - Nature of the Business and Operations and Liquidity (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Mar. 31, 2023
Feb. 28, 2021
Retained Earnings (Accumulated Deficit) $ (1,060,945)   $ (1,060,945) $ (1,055,547)  
Cash, Cash Equivalents, and Marketable Securities 22,000   22,000    
Net Cash Provided by (Used in) Operating Activities $ (2,245) $ (5,863)      
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent 5.00%        
Restructuring and Related Cost, Expected Cost $ 1,000   1,000    
Payments for Restructuring     700    
Restructuring and Related Cost, Expected Annual Savings $ 5,000   $ 5,000    
Inox Wind Limited [Member]          
Supply Commitment, Default, Letters of Credit to be Received         $ 250,000