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Note 9 - Share Based Payments - Stock Option Activity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Shares under option, shares (in shares) 1,450,000 1,900,000  
Shares under option, Weighted average exercise price (in dollars per share) $ 0.24 $ 0.21  
Shares under option, Aggregate intrinsic value $ 248   $ 0
Options granted, shares (in shares) 1,450,000 150,000  
Options granted, Weighted average exercise price (in dollars per share) $ 0.62 $ 0.46  
Options exercised, shares (in shares) (410,000) (450,000)  
Options exercised, Weighted average exercise price (in dollars per share) $ 0.10 $ 0.10  
Options cancelled and expired, shares (in shares) (150,000) (150,000)  
Options cancelled and expired, Weighted average exercise price (in dollars per share) $ (0.40) $ (0.51)  
Shares under option, Weighted average remaining contractual life (Year) 6 years 5 months 8 days 5 years 3 months 29 days  
Shares under option, shares (in shares) 2,340,000 1,450,000  
Shares under option, December 31, 2021 (in dollars per share) $ 0.49 $ 0.24