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Note 1 - Nature of the Business and Operations and Liquidity (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Mar. 31, 2022	Feb. 28, 2021
Retained Earnings (Accumulated Deficit), Total	$ (1,039,097)		$ (1,020,506)
Cash, Cash Equivalents, and Marketable Securities	27,800
Net Cash Provided by (Used in) Operating Activities, Total	$ (11,572)	$ (11,734)
Inox Wind Limited [Member]
Supply Commitment, Default, Letters of Credit to be Received				$ 250,000

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