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Note 10 - Share Based Payments - Stock Option Activity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Shares under option (in shares) 1,900,000 2,174,000
Shares under option, Weighted average exercise price (in dollars per share) $ 0.21 $ 0.27
Options granted, shares (in shares) 150,000 0
Options granted, Weighted average exercise price (in dollars per share) $ 0.46 $ 0
Options exercised, shares (in shares) (450,000) (24,000)
Options exercised, Weighted average exercise price (in dollars per share) $ 0.10 $ 0.10
Options cancelled and expired, shares (in shares) (150,000) (250,000)
Options cancelled and expired, Weighted average exercise price (in dollars per share) $ (0.51) $ (0.10)
Shares under option, Weighted average remaining contractual life (Year) 5 years 3 months 29 days 5 years 7 months 17 days
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 [1] $ 322  
[1] Aggregate intrinsic value includes only those options with intrinsic value (options where the exercise price is below the market price).