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Note 1 - Nature of the Business and Operations and Liquidity (Details Textual) $ in Thousands, € in Millions	1 Months Ended	3 Months Ended
	Dec. 31, 2015 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	May 29, 2020 EUR (€)	Mar. 31, 2020 USD ($)
Retained Earnings (Accumulated Deficit), Ending Balance		$ (982,052)			$ (978,635)
Cash, Cash Equivalents, and Marketable Securities		56,000
Net Cash Provided by (Used in) Operating Activities, Total		$ (3,115)	$ (5,866)
Inox Wind Limited [Member]
Supply Agreement, Aggregate Value	$ 210,000
Supply Commitment, Extension Period (Year)	3 years
Supply Commitment, Default, Letters of Credit to be Received | €				€ 6
Certificates of Deposit [Member] | Minimum [Member]
Debt Securities, Available-for-sale, Term (Month)		240 days
Certificates of Deposit [Member] | Maximum [Member]
Debt Securities, Available-for-sale, Term (Month)		1 year 270 days

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