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Note 1 - Nature of the Business and Operations and Liquidity (Details Textual)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 23, 2019
USD ($)
Mar. 28, 2019
USD ($)
Jul. 04, 2018
USD ($)
Jul. 03, 2018
USD ($)
Feb. 01, 2018
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Mar. 31, 2019
USD ($)
Dec. 27, 2018
USD ($)
Mar. 28, 2018
USD ($)
Retained Earnings (Accumulated Deficit), Ending Balance             $ (965,903)   $ (965,903)   $ (961,539)    
Cash, Cash Equivalents, and Marketable Securities             62,800   62,800        
Net Cash Provided by (Used in) Operating Activities, Total                 (10,485) $ 23,595      
Gain (Loss) Related to Litigation Settlement, Total             $ 0 $ 28,720 $ 0 $ 28,720      
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 $ 3,000                      
Inox Wind Limited [Member]                          
Supply Agreement, Aggregate Value           $ 210,000              
Supply Commitment, Extension Period           3 years              
Certificates of Deposit [Member] | Minimum [Member]                          
Debt Securities, Available-for-sale, Term             1 year   1 year        
Certificates of Deposit [Member] | Maximum [Member]                          
Debt Securities, Available-for-sale, Term             2 years   2 years