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Note 8 - Shareholders' Equity - Stock Option Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Options outstanding, options (in shares) 292,766 410,615
Options outstanding, weighted average exercise price (in dollars per share) $ 3.71 $ 3.5
Granted to employees and directors, options (in shares)   46,400
Granted to employees and directors, weighted average exercise price (in dollars per share)   $ 4.23
Exercised, options (in shares) (231,666) (140,916)
Exercised, weighted average exercise price (in dollars per share) $ 3.59 $ 3.29
Canceled/expired/forfeited, options (in shares)   (23,333)
Canceled/expired/forfeited, weighted average exercise price (in dollars per share)   $ 3.53
Options outstanding, options (in shares) 61,100 292,766
Options outstanding,, weighted average exercise price (in dollars per share) $ 4.17 $ 3.71
Options exercisable, options (in shares) 25,264  
Options exercisable, weighted average exercise price (in dollars per share) $ 4.14