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Stock Options (Tables)
 12 Months Ended
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
Following is a summary of activity in the Restricted Stock Units for the periods indicated:
  
 
2014
2013
2012
 
Shares
   Exercise
   Price*
Shares
   Exercise
   Price*
Shares
   Exercise
   Price*
Options outstanding at beginning of year
10,724

$
32.49

11,375

$
24.24

19,750

$
22.96

Granted
6,000

53.51

4,224

42.70

—

—

Exercised
(4,681
)
29.56

(4,875
)
22.07

(6,125
)
21.13

Cancelled
—

—

—

—

(2,250
)
21.45

Options outstanding at end of year
12,043

44.10

10,724

32.49

11,375

24.24


*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:
 
 
2014
2013
2012
 
Shares
   Exercise
   Price*
Shares
   Exercise
   Price*
Shares
   Exercise
   Price*
Options outstanding at beginning of year
292,350

$
26.68

330,730

$
21.82

377,480

$
19.27

Granted
48,250

52.67

49,000

42.70

61,000

32.76

Exercised
(27,700
)
24.33

(81,880
)
16.77

(99,650
)
19.26

Canceled
(11,100
)
35.42

(5,500
)
24.24

(8,100
)
17.20

Options outstanding at end of year
301,800

30.73

292,350

26.68

330,730

21.82

Options exercisable at end of year
172,450

$
22.30

154,950

$
21.57

192,830

$
19.48

Options available for grant at end of year
28,950

 

66,100

 

109,600

 

*Weighted Averages
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range
Options outstanding and exercisable at December 31, 2014 were as follows:
 
Qualified Stock Options
Options Outstanding
 
Options Exercisable
 
 
 
      Shares

Remaining
Contractual
Life (yrs)*
  Exercise
         Price*
 
 
 
        Shares
 
    Exercise
     Price*
Range of Exercise Price
 

 
 

 
 

 

$11.45 - $19.79
56,550

3.93
$
12.33

 
56,550

$
12.33

$22.39 - $42.70
197,500

5.74
$
30.70

 
115,900

$
27.16

$49.44 - $53.51
47,750

9.42
$
52.66

 
—

$
—

Total
301,800

 
 

 
172,450

 

*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:
 
 
2014
2013
2012
 
Shares
   Exercise
   Price*
Shares
   Exercise
   Price*
Shares
   Exercise
   Price*
Options outstanding at beginning of year
114,700

$
24.87

89,700

$
19.91

112,800

$
18.62

Granted
29,000

53.51

25,000

42.70

—

—

Exercised
(11,600
)
23.29

—

—

(23,100
)
13.62

Cancelled
—

—

—

—

—

—

Options outstanding at end of year
132,100

31.30

114,700

24.87

89,700

19.91

Options exercisable at end of year
71,100

$
19.85

57,900

$
19.89

38,100

$
21.91

Options available for grant at end of year
258,526

 

293,526

 

322,750

 

*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, 2014 were as follows:
Non-Qualified Stock Options
Options Outstanding
 
Options Exercisable
 
 
 
      Shares

   Remaining
   Contractual
   Life (yrs)*
 
        Exercise
          Price*
 
 
 
      Shares

 
 
   Exercise
     Price*
Range of Exercise Price
 

 
 

 
 

 
 

 $11.45
35,600

4.36
$
11.45

 
35,600

 
$
11.45

 $22.39 - $42.70
67,500

6.33
32.23

 
35,500

 
28.28

 $53.51
29,000

9.37
$
53.51

 
—

 
$
—

Total
132,100

 
 

 
71,100

 
 

*Weighted Averages