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Note 1 - Nature of the Business and Operations and Liquidity (Details Textual) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Mar. 31, 2022 | Feb. 28, 2021
Retained Earnings (Accumulated Deficit), Total | $ (1,029,216) |  | $ (1,020,506) |
Cash, Cash Equivalents, and Marketable Securities | 33,400 |  |  |
Net Cash Provided by (Used in) Operating Activities, Total | $ (5,863) | $ (5,829) |  |
Inox Wind Limited [Member] |  |  |  |
Supply Commitment, Default, Letters of Credit to be Received |  |  |  | $ 250,000

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