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Note 1 - Nature of the Business and Operations and Liquidity (Details Textual)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Nov. 13, 2019
USD ($)
$ / shares
shares
May 23, 2019
USD ($)
Mar. 28, 2019
USD ($)
Jul. 04, 2018
USD ($)
Jul. 03, 2018
USD ($)
Feb. 01, 2018
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
Dec. 27, 2018
USD ($)
Mar. 28, 2018
USD ($)
Nov. 13, 2014
$ / shares
Retained Earnings (Accumulated Deficit), Ending Balance               $ (972,748,000)   $ (972,748,000)   $ (961,539,000)      
Cash, Cash Equivalents, and Marketable Securities               60,500,000   60,500,000          
Net Cash Provided by (Used in) Operating Activities, Total                   (17,779,000) $ 47,786,000        
Gain (Loss) Related to Litigation Settlement, Total               $ 0 $ 24,978,000 0 53,698,000        
Proceeds from Warrant Exercises                   $ 6,139,000        
November 2014 Warrant [Member]                              
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 7.81                           $ 7.81
Proceeds from Warrant Exercises $ 6,100,000                            
Class of Warrant or Right, Warrants Exercised | shares 786,000                            
Class of Warrant or Right, Warrants Expired | shares 32,181                            
Sinovel [Member]                              
Litigation Settlement, Amount Awarded from Other Party         $ 57,500,000                    
Litigation Settlement, Number of Installments         2                    
Proceeds from Legal Settlements       $ 32,500,000                      
Litigation Receivable                         $ 25,000,000    
Gain (Loss) Related to Litigation Settlement, Total                       $ 52,700,000      
64 Jackson, LLC [Member]                              
Purchase and Sale Agreement, Total Consideration           $ 23,000,000                  
Purchase and Sale Agreement, Proceeds from Sale of Property, Plant and Equipment           17,000,000                  
Financing Receivable, after Allowance for Credit Loss, Noncurrent, Total           $ 6,000,000                  
Purchase and Sale Agreement, Proceeds from Sale of Property, Plant and Equipment, Net                           $ 16,900,000  
Notes Receivable, Stated Interest Rate                       1.96%   1.96%  
Proceeds from Collection of Notes Receivable   $ 3,000,000 $ 3,000,000                        
Inox Wind Limited [Member]                              
Supply Agreement, Aggregate Value             $ 210,000,000                
Supply Commitment, Extension Period             3 years                
Certificates of Deposit [Member] | Minimum [Member]                              
Debt Securities, Available-for-sale, Term               330 days   330 days          
Certificates of Deposit [Member] | Maximum [Member]                              
Debt Securities, Available-for-sale, Term               2 years   2 years