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Note 11 - Warrants (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Feb. 17, 2022
Feb. 03, 2022
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Mar. 27, 2023
Dec. 31, 2022
Common Stock, Par or Stated Value Per Share (in dollars per share)       $ 0.01   $ 0.01   $ 0.01 $ 0.01
Fair Value Adjustment of Warrants           $ 0 $ 274    
Warrants With Securities Purchase Agreement [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)     438,334            
Class of Warrant or Right, Fair Value Per Warrant (in dollars per share) $ 1.2057       $ 1.2057   $ 1.2057   $ 3.2781
Fair Value Adjustment of Warrants         $ 1,287   $ 4,950    
Pre-funded Warrants [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)     1,950,502            
Common Stock Warrants [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)     1,950,502            
Warrants and Rights Outstanding, Term (Year)     5 years            
Class of Warrant or Right, Outstanding (in shares) 2,388,836       2,388,836   2,388,836    
Class of Warrant or Right, Extension Term (Year) 1 year                
Lender Warrant [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   1,731,499   1,731,499   1,731,499      
Warrants and Rights Outstanding, Term (Year)   5 years             5 years
Class of Warrant or Right, Fair Value Per Warrant (in dollars per share) $ 1.1097       $ 1.1097   $ 1.1097   $ 2.4387
Fair Value Adjustment of Warrants         $ (894)   $ (2,302)    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 6.00   $ 6.00   $ 6.00      
Debt Instrument, Unamortized Discount, Increase                 $ 4,223
Class of Warrant or Right, Outstanding (in shares) 1,731,499       1,731,499   1,731,499    
Purchaser Warrant [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   466,667              
Warrants and Rights Outstanding, Term (Year)   5 years              
Class of Warrant or Right, Fair Value Per Warrant (in dollars per share) $ 1.2051       $ 1.2051   $ 1.2051   $ 2.5968
Fair Value Adjustment of Warrants         $ 252   $ 650    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 4.23              
Class of Warrant or Right, Waiver Fee   $ 175              
Class of Warrant or Right, Stated Price Per Share (in dollars per share)   $ 0.375              
Warrant Issuance Expense   $ 1,211   $ (0) $ (0) $ (0) $ 1,212    
Class of Warrant or Right, Outstanding (in shares) 466,667       466,667   466,667    
Securities Purchase Agreement [Member]                  
Stock Issued During Period, Shares, New Issues (in shares)     438,334            
Common Stock, Par or Stated Value Per Share (in dollars per share)     $ 0.01            
Sale of Common Stock and Warrants, Price Per Share (in dollars per share)     4.605            
Common Stock and Pre-funded Warrants [Member]                  
Sale of Common Stock and Warrants, Price Per Share (in dollars per share)     $ 4.6047            
Common Stock and Warrants [Member]                  
Proceeds from Issuance or Sale of Equity, Total     $ 11,000