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Note 3 - Shareholder's Equity - Information About Stock Options (Details)
 9 Months Ended
Sep. 30, 2025
$ / shares
shares
Options outstanding, options (in shares) | shares 61,100
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 4.17
Exercised, options (in shares) | shares 0
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 0
Options outstanding, options (in shares) | shares 61,100
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 4.17
Options exercisable, options (in shares) | shares 45,632
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 3.1