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Stock Options (Tables)
 12 Months Ended
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity
 2018 2017 2016 
Options available for grant at end of year146,075 176,294 207,608 
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:
  
  2018 2017 2016 
  Shares Grant-Date Fair Value*Shares Grant-Date Fair Value*Shares Grant-Date Fair Value*
Options outstanding at beginning of year 63,052 $70.08 45,621 $54.58 32,616 $53.31 
Granted 35,300 92.50 33,620 84.34 27,440 55.17 
Exercised (22,266)66.91 (16,189)56.03 (11,909)52.67 
Canceled(450)83.99 — — (2,526)53.57 
Options outstanding at end of year 75,636 81.39 63,052 70.08 45,621 54.58 
*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:
 
  2018 2017 2016 
  Shares 
  Exercise
   Price*
Shares 
  Exercise
   Price*
Shares 
  Exercise
   Price*
Options outstanding at beginning of year 172,875 $43.91 220,820 $37.39 254,195 $34.64 
Granted 9,500 92.50 10,750 83.99 21,000 54.87 
Exercised (41,205)34.89 (54,945)24.83 (43,775)26.59 
Canceled(1,000)54.49 (3,750)54.57 (10,600)50.68 
Options outstanding at end of year 140,170 49.78 172,875 43.91 220,820 37.39 
Options exercisable at end of year 96,320 $41.56 111,875 $36.44 136,220 $29.66 
Options available for grant at end of year336,450   344,950   353,450   
*Weighted Averages
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range Options outstanding and exercisable at December 31, 2018 were as follows:
 
Qualified Stock Options Options Outstanding Options Exercisable 
  
 Shares
Remaining Contractual Life (yrs)*Exercise Price*SharesExercise     Price*
Range of Exercise Price           
$11.45 - $24.69 6,000 0.53$13.66 6,000 $13.66 
$26.45 - $42.70 54,520 3.58$35.83 54,520 $35.83 
$49.44 - $83.99 70,150 6.56$57.92 35,800 $54.96 
$92.50 - $92.50 9,500 9.36$92.50 — $— 
Total 140,170     96,320   
*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:
 
  2018 2017 2016 
  Shares Exercise Price*Shares Exercise Price*Shares Exercise Price*
Options outstanding at beginning of year 67,000 $42.43 112,400 $34.48 127,300 $32.05 
Granted — — — — — — 
Exercised (26,800)41.61 (45,400)22.73 (14,900)13.73 
Canceled— — — — — — 
Options outstanding at end of year 40,200 42.99 67,000 42.43 112,400 34.48 
Options exercisable at end of year 34,400 $41.21 50,400 $39.86 85,000 $29.61 
*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, 2018 were as follows:
Non-Qualified Stock Options Options Outstanding Options Exercisable 
  Shares   Remaining Contractual Life (yrs)*Exercise Price*SharesExercise Price*
Range of Exercise Price           
$11.45 - $24.69 8,000 0.36$11.45 8,000 $11.45 
$26.45 - $42.70 3,200 2.3626.45 3,200 26.45 
$49.44 - $83.99 29,000 5.37$53.51 23,200 $53.51 
Total 40,200     34,400   
*Weighted Averages