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Note 1 - Nature of the Business and Operations and Liquidity (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2022 | Feb. 28, 2021
Retained Earnings (Accumulated Deficit), Total |  | $ (1,048,678) |  | $ (1,020,506) |
Cash, Cash Equivalents, and Marketable Securities |  | 23,700 |  |  |
Net Cash Provided by (Used in) Operating Activities, Total |  | $ (17,067) | $ (15,925) |  |
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent | 5.00% |  |  |  |
Restructuring and Related Cost, Expected Annual Savings | $ 5,000 |  |  |  |
Inox Wind Limited [Member] |  |  |  |  |
Supply Commitment, Default, Letters of Credit to be Received |  |  |  |  | $ 250,000

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