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Note 3 - Shareholders' Equity - Information About Stock Options (Details) - $ / shares
 9 Months Ended
Sep. 30, 2024
Options outstanding, options (in shares) 292,766
Options outstanding, weighted average exercise price (in dollars per share) $ 3.71
Exercised, options (in shares) (231,666)
Exercised, weighted average exercise price (in dollars per share) $ 3.59
Options outstanding, options (in shares) 61,100
Options outstanding, weighted average exercise price (in dollars per share) $ 4.17
Options exercisable, options (in shares) 25,264
Options exercisable, weighted average exercise price (in dollars per share) $ 4.14