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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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