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Stock Options (Tables)
 12 Months Ended
Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity
 
2022
2021
2020
Options available for grant at end of year381,531423,969455,549
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
Following is a summary of activity in the Restricted Stock Awards ("RSA")/Units for the periods indicated:
  
 202220212020
 SharesGrant-Date Fair Value*SharesGrant-Date Fair Value*SharesGrant-Date Fair Value*
Awards outstanding at beginning of year80,616 $129.53 91,043 $104.77 78,705 $94.34 
Granted48,396 133.70 35,224 157.00 44,307 111.95 
Exercised(29,922)122.19 (45,651)101.36 (31,594)88.90 
Canceled(1,460)143.82 — — (375)100.34 
Awards outstanding at end of year97,630 133.67 80,616 129.53 91,043 104.77 
*Weighted Averages
Qualified Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity
Following is a summary of activity in the Incentive Stock Option Plans for the periods indicated:
 
 202220212020
 Shares
  Exercise
   Price*
Shares
  Exercise
   Price*
Shares
  Exercise
   Price*
Options outstanding at beginning of year87,610 $91.24 100,920 $68.58 119,720 $57.65 
Granted17,625 137.93 18,900 156.38 13,950 114.53 
Exercised(14,780)50.79 (30,210)53.68 (31,300)45.94 
Canceled(5,808)114.48 (2,000)130.92 (1,450)96.97 
Options outstanding at end of year84,647 106.43 87,610 91.24 100,920 68.58 
Options exercisable at end of year43,412 $78.50 49,360 $61.21 67,700 $52.60 
Options available for grant at end of year286,033  297,850  314,750  
*Weighted Averages
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range Options outstanding and exercisable at December 31, 2022 were as follows:
 
Qualified Stock OptionsOptions OutstandingOptions Exercisable
 
 Shares
Remaining Contractual Life (yrs)*Exercise Price*SharesExercise     Price*
Range of Exercise Price     
$42.70 - $83.99
27,725 2.32$57.89 27,725 $57.89 
$92.50 - $138.75
40,422 7.57$119.34 12,387 $103.89 
$156.38 - $234.57
16,500 8.16$156.38 3,300 $156.38 
Total84,647   43,412  
*Weighted Averages
Non Qualified Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity
Following is a summary of activity in the Non-Qualified Stock Option Plans for the periods indicated:
 
 202220212020
 SharesExercise Price*SharesExercise Price*SharesExercise Price*
Options outstanding at beginning of year2,000 $53.51 3,000 $53.51 5,300 $46.87 
Granted— — — — — — 
Exercised(1,000)53.51 (1,000)53.51 (2,300)38.22 
Canceled— — — — — — 
Options outstanding at end of year1,000 53.51 2,000 53.51 3,000 53.51 
Options exercisable at end of year1,000 $53.51 2,000 $53.51 3,000 $53.51 
*Weighted Averages
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range Options outstanding and exercisable as of December 31, 2022 were as follows:
Non-Qualified Stock OptionsOptions OutstandingOptions Exercisable
 Shares   Remaining Contractual Life (yrs)*Exercise Price*SharesExercise Price*
Range of Exercise Price     
 $42.70 - $83.99
1,000 1.36$53.51 1,000 $53.51 
Total1,000   1,000  
*Weighted Averages