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Note 1 - Organization (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 2 Months Ended 6 Months Ended
Feb. 02, 2021
Sep. 01, 2020
Aug. 25, 2020
Aug. 11, 2020
Aug. 06, 2020
Jul. 09, 2020
Jul. 09, 2020
Jun. 26, 2020
May 06, 2020
Apr. 30, 2020
Apr. 23, 2020
Jan. 31, 2020
Feb. 28, 2021
Jan. 31, 2020
Sep. 30, 2020
Jul. 31, 2020
May 31, 2020
Jun. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Retained Earnings (Accumulated Deficit), Ending Balance                                     $ (379,757) $ (367,341)
Cash and Cash Equivalents, at Carrying Value, Ending Balance                                     $ 23,078 $ 22,185
Share Price (in dollars per share)                                     $ 0.74  
COVID 19 [Member]                                        
Reduction of Non-manufacturing Employees Salaries                                   20.00%    
Reduction of Hours Worked by Manufacturing Workers, Percentage                                   20.00%    
Paycheck Protection Program CARES Act [Member]                                        
Proceeds from Issuance of Long-term Debt, Total                     $ 2,300                  
January 2020 Public Offering [Member]                                        
Proceeds from Issuance or Sale of Equity, Net                       $ 3,900   $ 3,900            
Stock Issued During Period, Shares, New Issues (in shares)                       6,428,572                
Share Price (in dollars per share)                       $ 0.70   $ 0.70            
April and May 2020 Public Offering [Member]                                        
Proceeds from Issuance or Sale of Equity, Net                                 $ 3,000      
June and July 2020 Public Offering [Member]                                        
Proceeds from Issuance or Sale of Equity, Net                               $ 5,500        
August and September 2020 Public Offering [Member]                                        
Proceeds from Issuance or Sale of Equity, Net                             $ 11,300          
February 2021 Public Offering [Member]                                        
Proceeds from Issuance or Sale of Equity, Net $ 13,100                       $ 13,100              
Stock Issued During Period, Shares, New Issues (in shares) 10,000,000                                      
Share Price (in dollars per share) $ 1.44                                      
April 2020 Public Offering [Member]                                        
Stock Issued During Period, Shares, New Issues (in shares)                   12,600,000                    
Share Price (in dollars per share)                   $ 0.25                    
May 2020 Public Offering [Member]                                        
Proceeds from Issuance or Sale of Equity, Net                 $ 3,000                      
Stock Issued During Period, Shares, New Issues (in shares)                 1,890,000                      
June 2020 Public Offering [Member]                                        
Stock Issued During Period, Shares, New Issues (in shares)               20,000,000                        
Share Price (in dollars per share)               $ 0.27                        
July 2020 Public Offering [Member]                                        
Proceeds from Issuance or Sale of Equity, Net           $ 5,500 $ 700                          
Stock Issued During Period, Shares, New Issues (in shares)             3,000,000                          
August 2020 Public Offering [Member]                                        
Proceeds from Issuance or Sale of Equity, Net       $ 6,200                                
Stock Issued During Period, Shares, New Issues (in shares)     11,063,830 2,368,421 15,789,474                              
Share Price (in dollars per share)     $ 0.47   $ 0.38                              
September 2020 Public Offering [Member]                                        
Proceeds from Issuance or Sale of Equity, Net   $ 5,100                                    
Stock Issued During Period, Shares, New Issues (in shares)   1,000,000