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Note 14 - Warrants - Warrant Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Balance (in shares) 417,550 106,300
Balance, exercise price (in dollars per share) $ 2.66 $ 3.99
Warrants granted (in shares) 1,175,000 311,250
Warrants granted, exercise price (in dollars per share) $ 2.4 $ 2.21
Warrants expired (in shares) (1,300)  
Warrants expired, exercise price (in dollars per share) $ (3)  
Balance (in shares) 1,591,250 417,550
Balance, exercise price (in dollars per share) $ 2.47 $ 2.66
Exercisable, December 31, 2022 (in shares) 1,591,250  
Exercisable, exercise price (in dollars per share) $ 2.47