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Note 19 - The Financing and Warrant Liabilities (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jan. 17, 2018
Dec. 31, 2018
Warrants and Rights Outstanding $ 2,275 $ 606
Investor Warrants [Member]    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 645,000  
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 6.60  
Class of Warrant or Right, Term 2 years 180 days  
Warrants and Rights Outstanding $ 1,890 503
Placement Agent Warrants [Member]    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 129,000  
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 6.60  
Class of Warrant or Right, Term 3 years  
Warrants and Rights Outstanding $ 385 103
The Warrants [Member]    
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 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%  
Private Placement [Member]    
Stock Issued During Period, Shares, New Issues 2,150,001  
Shares Issued, Price Per Share $ 5.15  
Proceeds from Issuance or Sale of Equity, Total $ 11,100 11,073
Placement Agent Fee, Percent of Gross Proceeds 6.00%  
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs $ 1,200 1,200
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   $ 390