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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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