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Note 16 - The Financing and Warrant Liabilities (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 14, 2020
Aug. 07, 2019
Dec. 31, 2020
Dec. 31, 2019
Sep. 25, 2019
Dec. 31, 2018
Warrants and Rights Outstanding $ 2,051   $ 1,505 $ 107   $ 606
Stock Issued During Period, Value, New Issues     4,199 4,787    
Additional Paid-in Capital [Member]            
Stock Issued During Period, Value, New Issues     4,195 4,783    
Investor Warrants [Member]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 1,728,396          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 2.03          
Warrants and Rights Outstanding $ 1,746   1,279      
Placement Agent Warrants [Member]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 302,469          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 2.03          
Warrants and Rights Outstanding $ 305   224      
The Warrants [Member] | Minimum [Member]            
Class of Warrant or Right, Beneficial Ownership Percentage 4.99%          
The Warrants [Member] | Maximum [Member]            
Class of Warrant or Right, Beneficial Ownership Percentage 9.99%          
Warrants Issued January 17, 2018 Containing Full Ratchet Price Protection [Member]            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 1.4927  
Private Placement [Member]            
Stock Issued During Period, Shares, New Issues (in shares) 4,320,989 3,216,860        
Shares Issued, Price Per Share (in dollars per share) $ 1.62 $ 1.4927        
Proceeds from Issuance or Sale of Equity, Total $ 7,000   7,000      
Sale of Equity, Placement Fee, Percent 7.00%          
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs $ 1,060     $ 15    
Placement Agent Fee 490          
Stock Issuance Costs, Other Offering Costs $ 260          
Stock Issued During Period, Value, New Issues   $ 4,800        
Private Placement [Member] | Additional Paid-in Capital [Member]            
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs   15        
Stock Issued During Period, Value, New Issues   $ 4,790        
Private Placement [Member] | Investor Warrants [Member]            
Warrants and Rights Outstanding     $ 1,746