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Note 16 - The Financing and Warrant Liabilities (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Feb. 18, 2021
Dec. 14, 2020
Jan. 17, 2018
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Warrants and Rights Outstanding $ 11,921     $ 10,919 $ 1,505 $ 61 $ 107
Investor Warrants [Member]              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 2,606,000 1,728,396 645,000        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 3.59 $ 2.03          
Warrants and Rights Outstanding $ 10,476     5,942   45 71
Placement Agent Warrants [Member]              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 364,840 302,469          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 4.4875   $ 6.60        
Warrants and Rights Outstanding $ 1,445     817   $ 16 $ 36
Warrants and Rights Outstanding, Term (Year)     3 years        
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) 5,212,000 4,320,989 2,150,001        
Shares Issued, Price Per Share (in dollars per share) $ 3.59   $ 5.15        
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        
Proceeds from Issuance or Sale of Equity, Total $ 18,700     18,711      
Sale of Equity, Placement Fee, Percent 7.00%            
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs $ 3,050            
Placement Agent Fee 1,310            
Stock Issuance Costs, Other Offering Costs $ 290            
Private Placement [Member] | Investor Warrants [Member]              
Warrants and Rights Outstanding       $ 10,480