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The following table summarizes stock option information as of June 30, 2024: (Details)
 3 Months Ended
Mar. 31, 2025
$ / shares
shares
Equity:  
Options shares under option - beginning of year 246,430
Weighted average exercise price shares under option - beginning of year | $ / shares $ 103.24
Options forfeited (3,800)
Weighted average exercise price options forfeited | $ / shares $ 124.09
Options exercised (13,830)
Weighted average exercise price options exercised | $ / shares $ 77.88
Options shares under option - end of year 228,800
Weighted average exercise price shares under option - end of year | $ / shares $ 104.43
Options exercisable 115,050
Weighted average exercise price options exercisable | $ / shares $ 82.06
Options available for future grants 498,195