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Stock Options (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity
 
2021
2020
2019
Options available for grant at end of year423,969455,549499,640
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:
  
 202120202019
 SharesGrant-Date Fair Value*SharesGrant-Date Fair Value*SharesGrant-Date Fair Value*
Awards outstanding at beginning of year91,043 $104.77 78,705 $94.34 75,636 $81.39 
Granted35,224 157.00 44,307 111.95 36,060 105.69 
Exercised(45,651)101.36 (31,594)88.90 (32,466)69.94 
Canceled— — (375)100.34 (525)99.96 
Awards outstanding at end of year80,616 129.53 91,043 104.77 78,705 94.34 
*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:
 
 202120202019
 Shares
  Exercise
   Price*
Shares
  Exercise
   Price*
Shares
  Exercise
   Price*
Options outstanding at beginning of year100,920 $68.58 119,720 $57.65 140,170 $49.78 
Granted18,900 156.38 13,950 114.53 12,150 105.56 
Exercised(30,210)53.68 (31,300)45.94 (28,100)38.93 
Canceled(2,000)130.92 (1,450)96.97 (4,500)58.57 
Options outstanding at end of year87,610 91.24 100,920 68.58 119,720 57.65 
Options exercisable at end of year49,360 $61.21 67,700 $52.60 85,070 $47.10 
Options available for grant at end of year297,850  314,750  327,250  
*Weighted Averages
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range Options outstanding and exercisable at December 31, 2021 were as follows:
 
Qualified Stock OptionsOptions OutstandingOptions Exercisable
 
 Shares
Remaining Contractual Life (yrs)*Exercise Price*SharesExercise     Price*
Range of Exercise Price     
$32.76 - $52.51
16,100 1.49$40.88 16,100 $40.88 
$53.51 - $80.27
19,800 3.35$54.20 19,800 $54.20 
$83.99 - $125.99
33,710 7.08$102.27 13,460 $95.85 
$156.38 - $234.57
18,000 9.16$156.38 — $— 
Total87,610   49,360  
*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:
 
 202120202019
 SharesExercise Price*SharesExercise Price*SharesExercise Price*
Options outstanding at beginning of year3,000 $53.51 5,300 $46.87 40,200 $42.99 
Granted— — — — — — 
Exercised(1,000)53.51 (2,300)38.22 (34,900)42.40 
Canceled— — — — — — 
Options outstanding at end of year2,000 53.51 3,000 53.51 5,300 46.87 
Options exercisable at end of year2,000 $53.51 3,000 $53.51 5,300 $46.87 
*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, 2021 were as follows:
Non-Qualified Stock OptionsOptions OutstandingOptions Exercisable
 Shares   Remaining Contractual Life (yrs)*Exercise Price*SharesExercise Price*
Range of Exercise Price     
 $53.51 - $80.27
2,000 2.36$53.51 2,000 $53.51 
Total2,000   2,000  
*Weighted Averages