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Note 10 - Share Based Payments - Non-vested Stock Options (Details) - $ / shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Non-vested stock options, shares (in shares) 83,334 416,667
Non-vested stock options, Weighted average fair value (in dollars per share) $ 0.47 $ 0.47
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 150,000 0
Options granted, Weighted average fair value (in dollars per share) $ 0.46 $ 0
Vested during period, shares (in shares) (83,334) (83,833)
Vested during period, Weighted average fair value (in dollars per share) $ (0.47) $ (0.47)
Options cancelled, shares (in shares) 0 (250,000)
Options cancelled, Weighted average fair value (in dollars per share) $ 0 $ (0.80)
Non-vested shares under option, shares (in shares) 150,000 83,334
Non-vested shares under option, Weighted average fair value (in dollars per share) $ 0.46 $ 0.47