Note 1 - Nature of the Business and Operations and Liquidity (Details Textual) $ in Thousands					1 Months Ended	12 Months Ended
	Mar. 28, 2019 USD ($)	Jul. 04, 2018 USD ($)	Jul. 03, 2018 USD ($)	Feb. 01, 2018 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Dec. 27, 2018 USD ($)	Apr. 01, 2018 USD ($)	Mar. 28, 2018 USD ($)	Mar. 31, 2017 USD ($)
Net Income (Loss) Attributable to Parent, Total						$ 26,761	$ (32,776)
Retained Earnings (Accumulated Deficit), Ending Balance						(961,539)	(988,333)		$ (988,366)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance						78,198	34,249				$ 27,744
Net Cash Provided by (Used in) Operating Activities, Total						42,714	(24,827)
Gain (Loss) Related to Litigation Settlement, Total						52,698
Financing Receivable, after Allowance for Credit Loss, Noncurrent, Total							$ 2,559		$ 2,664
Sinovel [Member]
Litigation Settlement, Amount Awarded from Other Party			$ 57,500
Litigation Settlement, Number of Installments			2
Proceeds from Legal Settlements		$ 32,500
Litigation Receivable								$ 25,000
Gain (Loss) Related to Litigation Settlement, Total						$ 52,700
64 Jackson, LLC [Member]
Purchase and Sale Agreement, Total Consideration				$ 23,000
Purchase and Sale Agreement, Proceeds from Sale of Property, Plant and Equipment				17,000
Financing Receivable, after Allowance for Credit Loss, Noncurrent, Total				$ 6,000
Purchase and Sale Agreement, Proceeds from Sale of Property, Plant and Equipment, Net										$ 16,900
Notes Receivable, Stated Interest Rate				1.96%						1.96%
Proceeds from Collection of Notes Receivable	$ 3,000
Inox Wind Limited [Member]
Supply Agreement, Aggregate Value					$ 210,000
Supply Commitment, Extension Period					3 years