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Note 3 - Shareholders' Equity - Information About Stock Options (Details)
 6 Months Ended
Jun. 30, 2024
$ / shares
shares
Options outstanding, options (in shares) | shares 292,766
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 3.71
Exercised, options (in shares) | shares (226,666)
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 3.59
Options outstanding, options (in shares) | shares 66,100
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 4.12
Options exercisable, options (in shares) | shares 9,899
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 3.7