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Note 12 - Warrants (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jun. 30, 2022
Feb. 03, 2022
Dec. 31, 2022
Dec. 31, 2021
Feb. 28, 2022
Feb. 17, 2022
Dec. 31, 2020
Common Stock, Par or Stated Value Per Share (in dollars per share)     $ 0.01 $ 0.01      
Additional Paid in Capital, Total     $ 75,770 $ 60,863      
Adjustments to Additional Paid in Capital, Warrant Repricing     $ 0        
Minimum [Member]              
Class of Warrant or Right, Strike Price (in dollars per share)     $ 10.23 $ 17.40 $ 16.83   $ 18.27
Maximum [Member]              
Class of Warrant or Right, Strike Price (in dollars per share)     10.44 $ 17.88 $ 17.31   $ 18.75
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)     $ 3.2781        
Fair Value Adjustment of Warrants     $ (4,951)        
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            
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  
Warrants and Rights Outstanding, Term (Year)     5 years     5 years  
Class of Warrant or Right, Fair Value Per Warrant (in dollars per share)     $ 2.4387        
Fair Value Adjustment of Warrants     $ (2,302)        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 6.00     $ 6.00  
Debt Instrument, Unamortized Discount, Increase     $ 4,223        
Class of Warrant or Right, Outstanding (in shares) 1,731,499            
Class of Warrant or Right, Extension Term (Year) 1 year            
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)     $ 2.5968        
Fair Value Adjustment of Warrants     $ (649)        
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  
Class of Warrant or Right, Issuance Expense     1,212 $ (0)      
Class of Warrant or Right, Outstanding (in shares) 466,667            
Class of Warrant or Right, Extension Term (Year) 1 year            
Amendment to Warrants [Member]              
Fair Value Adjustment of Warrants     345 $ (0)      
Amendment to Warrants [Member] | Reclassified From Noncurrent Liabilities to Additional Paid-in-capital [Member]              
Additional Paid in Capital, Total     $ 5,709        
Warrants Containing Weighted Average Anti-dilution Protection [Member]              
Class of Warrant or Right, Outstanding (in shares)     68,508 307,123      
Adjustments to Additional Paid in Capital, Warrant Repricing     $ 31        
Warrants Containing Weighted Average Anti-dilution Protection [Member] | Weighted Average [Member]              
Warrants and Rights Outstanding, Term (Year)     2 months 26 days 1 year 8 months 15 days      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 10.41        
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