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Note 8 - Outstanding Warrants (Details Textual) - $ / shares
Jun. 30, 2023
Dec. 31, 2022
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 11.78 $ 15.92
Warrants and Rights Outstanding, Term (Year) 6 years 4 months 24 days 7 years 5 months 23 days
Warrants to Purchase Common Stock [Member]    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 100,000  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 2.50  
Warrants and Rights Outstanding, Term (Year) 2 years  
Stock Issued During Period, Warrants Exercised (in shares) 62,293  
Warrants to Purchase Common Stock [Member] | Senior Leaders [Member]    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 160,000  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 2.00