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Note 1 - Nature of the Business and Operations and Liquidity (Details Textual) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2023	Mar. 31, 2023	Mar. 31, 2022	Feb. 28, 2021
Retained Earnings (Accumulated Deficit)		$ (1,055,547)	$ (1,020,506)
Cash, Cash Equivalents, and Marketable Securities		23,400
Net Cash Provided by (Used in) Operating Activities		$ (22,485)	$ (18,977)
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent	5.00%
Payments for Restructuring	$ 1,000
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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