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Note 16 - The Financing and Warrant Liabilities (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jul. 02, 2021
Feb. 18, 2021
Dec. 14, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jan. 17, 2018
Warrants and Rights Outstanding       $ 2,039 $ 1,505 $ 107  
Investor Warrants [Member]              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   2,606,000          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 3.59          
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          
Warrants and Rights Outstanding   $ 1,450          
Stock Issued During Period, Shares, Cashless Warrants Exercised (in shares) 40,000.00            
Placement Agent Warrants [Member] | Other Nonoperating Income (Expense) [Member]              
Gain (Loss), Exercise of Cashless Warrants $ (20)            
The Warrants [Member]              
Warrants and Rights Outstanding     $ 310        
The Warrants [Member] | Minimum [Member]              
Class of Warrant or Right, Beneficial Ownership Percentage   4.99% 4.99%        
The Warrants [Member] | Maximum [Member]              
Class of Warrant or Right, Beneficial Ownership Percentage   9.99% 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        
Shares Issued, Price Per Share (in dollars per share)   $ 3.59 $ 1.62        
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        
Proceeds from Issuance or Sale of Equity, Total   $ 18,700 $ 7,000 18,711 7,000    
Sale of Equity, Placement Fee, Percent   7.00% 7.00%        
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs   $ 3,050 $ 1,060        
Placement Agent Fee   1,310 490        
Stock Issuance Costs, Other Offering Costs   $ 290 $ 260        
Private Placement [Member] | Investor Warrants [Member]              
Warrants and Rights Outstanding       $ 10,476 $ 1,746