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Note 7 - Embedded Derivatives Liabilities (Details Textual)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2017
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2019
USD ($)
Aug. 31, 2020
shares
Aug. 25, 2020
shares
Jul. 31, 2020
shares
Jul. 06, 2020
shares
Jan. 31, 2020
Jan. 10, 2020
Dec. 31, 2019
USD ($)
shares
Apr. 19, 2017
Embedded Derivative, Fair Value of Embedded Derivative, Net, Total | $   $ 30   $ 30               $ 0  
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net, Total | $   $ 247 $ (29) $ 394                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   2,734,198   2,734,198               56,033,028  
The Series 2020 A Warrants [Member]                          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   2,682,166 [1]   2,682,166 [1]       30,000,000       30,000,000 [1]  
Series 2020 B Warrants [Member]                          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   [1]   [1]       9,103,334 30,000,000     9,103,334 [1]  
Series 2020C Warrants [Member]                          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   [1]   [1]   16,532,232 16,532,232         16,532,232 [1]  
Embedded Derivative, 2020/21 Convertible Notes [Member]                          
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net, Total | $   $ 200 $ 0 $ (30) $ 400                
Convertible 2020 Notes [Member]                          
Debt Instrument, Interest Rate, Stated Percentage 12.00%                       12.00%
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger 150.00%                        
Debt Instrument, Convertible, Threshold Consecutive Trading Days 10                        
Number of Embedded Derivative 1                        
Convertible 2017 Notes [Member]                          
Debt Instrument, Interest Rate, Stated Percentage 12.00%                        
Convertible 2020/21 Notes [Member]                          
Debt Instrument, Interest Rate, Stated Percentage                   12.00% 12.00%    
[1] The Series 2020-A, Series 2020-B and Series 2020-C Warrants are equity-classified warrants.