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Note 1 - Nature of the Business and Operations and Liquidity (Details Textual) - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Mar. 31, 2023
Feb. 28, 2021
Retained Earnings (Accumulated Deficit) $ (1,063,430)   $ (1,055,547)  
Cash, Cash Equivalents, and Marketable Securities 22,800      
Net Cash Provided by (Used in) Operating Activities $ (1,348) $ (11,572)    
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent 5.00%      
Restructuring and Related Cost, Expected Cost $ 1,000      
Payments for Restructuring 800      
Restructuring and Related Cost, Expected Annual Savings $ 5,000      
Inox Wind Limited [Member]        
Supply Commitment, Default, Letters of Credit to be Received       $ 250,000