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Note 1 - Nature of the Business and Operations and Liquidity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
May 06, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2021 | May 29, 2020
Retained Earnings (Accumulated Deficit), Ending Balance |  | $ (1,015,474) |  | $ (1,001,313) |
Cash, Cash Equivalents, and Marketable Securities |  | 43,900 |  |  |
Net Cash Provided by (Used in) Operating Activities, Total |  | (15,925) | $ (4,871) |  |
Payments to Acquire Businesses, Gross |  | $ 11,479 | $ 26,000 |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.01 |  |  |  |
Neeltran Inc. [Member] |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 4,400 |  |  |  |
AMSC Husky LLC [Member] |  |  |  |  |
Payments to Acquire Real Estate, Total | 4,300 |  |  |  |
Inox Wind Limited [Member] |  |  |  |  |
Supply Commitment, Default, Letters of Credit to be Received |  |  |  |  | $ 250,000
TD Bank [Member] | AMSC Husky LLC [Member] |  |  |  |  |
Payments to Acquire Real Estate, Total | 1,900 |  |  |  |
Neeltran Inc. Sellling Stockholders [Member] | Neeltran Inc. [Member] |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 1,000 |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | 301,556 |  |  |  |
Capanna, Sr. and Capanna, Jr. [Member] | Neeltran Inc. [Member] |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 1,100 |  |  |  |
Neeltran Third Party Lenders [Member] | Neeltran Inc. [Member] |  |  |  |  |
Payments to Acquire Businesses, Gross | 7,600 |  |  |  |
Neeltran Third Party Lenders [Member] | Neeltran Inc. [Member] | Indebtedness Secured by Mortgage on Real Property [Member] |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 1,900 |  |  |  |

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