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v3.20.2

Note 1 - Nature of the Business and Operations and Liquidity (Details Textual) $ / shares in Units, $ in Thousands, € in Millions |  |  |  | 1 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 26, 2020 USD ($) $ / shares shares | Oct. 01, 2020 USD ($) shares | Sep. 02, 2020 EUR (€) | Dec. 31, 2015 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 11, 2020 EUR (€) | May 29, 2020 EUR (€) | Mar. 31, 2020 USD ($)
Retained Earnings (Accumulated Deficit), Ending Balance |  |  |  |  | $ (985,764) |  |  |  | $ (978,635)
Cash, Cash Equivalents, and Marketable Securities |  |  |  |  | 51,400 |  |  |  |
Net Cash Provided by (Used in) Operating Activities, Total |  |  |  |  | $ (6,553) | $ (10,485) |  |  |
Subsequent Event [Member] | Public Offering [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | shares | 3,670,000 |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares | $ 15 |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock | $ 51,400 |  |  |  |  |  |  |  |
Additional Shares to be Issued (in shares) | shares | 550,500 |  |  |  |  |  |  |  |
Northeast Power Systems, Inc (NEPSI) [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 26,000 |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares |  | 873,657 |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable |  | $ 1,000,000,000 |  |  |  |  |  |  |
Northeast Power Systems, Inc (NEPSI) [Member] | Subsequent Event [Member] | Restricted Common Stock [Member] |  |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares |  | 873,657 |  |  |  |  |  |  |
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 | € |  |  |  |  |  |  | € 4.7 | € 6.0 |
Supply Commitment, Letters of Credit Received | € |  |  | € 1.3 |  |  |  |  |  |
Certificates of Deposit [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale, Term (Month) |  |  |  |  | 180 days |  |  |  |
Certificates of Deposit [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale, Term (Month) |  |  |  |  | 330 days |  |  |  |

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