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The following table summarizes stock option information as of June 30, 2025: (Details)
 6 Months Ended
Jun. 30, 2025
$ / shares
shares
Equity:  
Options shares under option - beginning of year 248,430
Weighted average exercise price shares under option - beginning of year | $ / shares $ 103
Options forfeited (6,200)
Weighted average exercise price options forfeited | $ / shares $ 124.61
Options exercised (27,430)
Weighted average exercise price options exercised | $ / shares $ 76.98
Options shares under option - end of year 214,800
Weighted average exercise price shares under option - end of year | $ / shares $ 105.7
Options exercisable 103,250
Weighted average exercise price options exercisable | $ / shares $ 82.55
Options available for future grants 498,595