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Note 1 - Nature of the Business and Operations and Liquidity (Details Textual) - USD ($) $ in Thousands	6 Months Ended	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Mar. 31, 2023	Feb. 28, 2021
Retained Earnings (Accumulated Deficit)		$ (1,065,079)		$ (1,055,547)
Cash, Cash Equivalents, and Marketable Securities		24,000
Net Cash Provided by (Used in) Operating Activities		(97)	$ (17,067)
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent	5.00%
Restructuring and Related Cost, Expected Cost	$ 1,000
Payments for Restructuring		900
Restructuring Reserve		103		$ 717
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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