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Note 16 - The Financing and Warrant Liabilities (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Aug. 07, 2019
Jan. 17, 2018
Dec. 31, 2019
Dec. 31, 2018
Sep. 25, 2019
Jan. 31, 2018
Stock Issued During Period, Value, New Issues     $ 4,787 $ 7,988    
Warrants and Rights Outstanding     107 606   $ 2,275
Investor Warrants [Member]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   645,000        
Class of Warrant or Right, Term (Month)   2 years 180 days        
Warrants and Rights Outstanding   $ 1,890 71 503   1,890
Placement Agent Warrants [Member]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   129,000        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 6.60        
Warrants and Rights Outstanding, Term (Year)   3 years        
Warrants and Rights Outstanding   $ 385 36 103   $ 385
The Warrants [Member]            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 6.60        
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  
Additional Paid-in Capital [Member]            
Stock Issued During Period, Value, New Issues     4,783 7,986    
Private Placement [Member]            
Stock Issued During Period, Shares, New Issues (in shares) 3,216,860 2,150,001        
Stock Issued During Period, Value, New Issues $ 4,800          
Shares Issued, Price Per Share (in dollars per share) $ 1.4927 $ 5.15        
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs $ 15   $ 15 1,194    
Proceeds from Issuance or Sale of Equity, Total   $ 11,100   11,073    
Placement Agent Fee, Percent of Gross Proceeds   6.00%        
Placement Agent Fee   $ 660        
Direct Legal Fees   $ 150        
Private Placement [Member] | Investor Warrants [Member]            
Warrants and Rights Outstanding       1,890    
Private Placement [Member] | Placement Agent Warrants [Member]            
Warrants and Rights Outstanding       $ 385    
Private Placement [Member] | Additional Paid-in Capital [Member]            
Stock Issued During Period, Value, New Issues $ 4,790