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Stock Options (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity
 
2020 (1)
2019 (1)
2018 (2)
Options available for grant at end of year455,549499,640146,075
(1) In 2020 and 2019, options available are from the 2019 Equity Incentive Plan.
(2) In 2018, options available are from the 2009 Equity Incentive Plan.
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
Following is a summary of activity in the Restricted Stock Awards for the periods indicated:
  
 202020192018
 SharesGrant-Date Fair Value*SharesGrant-Date Fair Value*SharesGrant-Date Fair Value*
Awards outstanding at beginning of year78,705 $94.34 75,636 $81.39 63,052 $70.08 
Granted44,307 111.95 36,060 105.69 35,300 92.50 
Exercised(31,594)88.90 (32,466)69.94 (22,266)66.91 
Canceled(375)100.34 (525)99.96 (450)83.99 
Awards outstanding at end of year91,043 104.77 78,705 94.34 75,636 81.39 
*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:
 
 202020192018
 Shares
  Exercise
   Price*
Shares
  Exercise
   Price*
Shares
  Exercise
   Price*
Options outstanding at beginning of year119,720 $57.65 140,170 $49.78 172,875 $43.91 
Granted13,950 114.53 12,150 105.56 9,500 92.50 
Exercised(31,300)45.94 (28,100)38.93 (41,205)34.89 
Canceled(1,450)96.97 (4,500)58.57 (1,000)54.49 
Options outstanding at end of year100,920 68.58 119,720 57.65 140,170 49.78 
Options exercisable at end of year67,700 $52.60 85,070 $47.10 96,320 $41.56 
Options available for grant at end of year314,750  327,250  336,450  
*Weighted Averages
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range Options outstanding and exercisable at December 31, 2020 were as follows:
 
Qualified Stock OptionsOptions OutstandingOptions Exercisable
 
 Shares
Remaining Contractual Life (yrs)*Exercise Price*SharesExercise     Price*
Range of Exercise Price     
$26.45 - $42.70
20,870 1.38$34.07 20,870 $34.07 
$49.44 - $74.16
40,500 3.64$53.47 37,700 $53.36 
$83.99 - $125.99
39,550 8.03$102.28 9,130 $91.84 
Total100,920   67,700  
*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:
 
 202020192018
 SharesExercise Price*SharesExercise Price*SharesExercise Price*
Options outstanding at beginning of year5,300 $46.87 40,200 $42.99 67,000 $42.43 
Granted— — — — — — 
Exercised(2,300)38.22 (34,900)42.40 (26,800)41.61 
Canceled— — — — — — 
Options outstanding at end of year3,000 53.51 5,300 46.87 40,200 42.99 
Options exercisable at end of year3,000 $53.51 5,300 $46.87 34,400 $41.21 
*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, 2020 were as follows:
Non-Qualified Stock OptionsOptions OutstandingOptions Exercisable
 Shares   Remaining Contractual Life (yrs)*Exercise Price*SharesExercise Price*
Range of Exercise Price     
 $49.44 - $74.16
3,000 3.36$53.51 3,000 $53.51 
Total3,000   3,000  
*Weighted Averages