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Earnings Per Common Share And Share Awards (Tables)
6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Computation Of Basic And Diluted Earnings Per Share
The following table sets forth the computation of basic and diluted earnings per share for the three- and six-month periods ended June 30:
 
Three Months Ended June 30,
Six Months Ended June 30,
 
2016
 
2015
2016
 
2015
Net income attributable to the Company
$
4,529,380

 
$
4,120,497

$
6,343,420

 
$
5,846,621

Weighted average common shares outstanding – Basic
1,923,213

 
2,004,698

1,928,766

 
2,008,718

Incremental shares outstanding assuming the exercise of dilutive stock options and SARs (share-settled)
5,412

 
4,797

6,559

 
5,160

Weighted average common shares outstanding – Diluted
1,928,625

 
2,009,495

1,935,325

 
2,013,878

Basic earnings per common share
$
2.36

 
$
2.06

$
3.29

 
$
2.91

Diluted earnings per common share
$
2.35

 
$
2.05

$
3.28

 
$
2.90

Summary Of Share-Based Award Transactions
A summary of share-based award transactions for all share-based award plans follows:
 
Number
Of Shares
 
Weighted
Average
Exercise Price
 
Average Remaining
Contractual
Term (Years)
 
Aggregate
Intrinsic
Value
Outstanding as of January 1, 2015
21,000

 
$
51.30

 
3.64
 
$
453,510

SARs granted
4,500

 
73.00

 
 
 
 

SARs exercised
(2,000
)
 
47.88

 
 
 
 

Options exercised
(1,500
)
 
36.79

 
 
 
 

Outstanding as of December 31, 2015
22,000

 
$
57.04

 
3.93
 
$
945,055

SARs granted
4,500

 
93.87

 
 
 
 

SARs exercised
(2,000
)
 
32.00

 
 
 
 

Outstanding as of June 30, 2016
24,500

 
$
65.85

 
4.35
 
$
720,265

 
 
 
 
 
 
 
 
Exercisable as of June 30, 2016
21,125

 
$
61.38

 
3.95
 
$
715,607

 
 
 
 
 
 
 
 
Unvested as of June 30, 2016
3,375

 
$
93.87

 
6.88
 
$
4,658

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The weighted average fair values for SARs issued during 2016 and 2015 were estimated using the weighted average assumptions shown in the table below:
 
2016
 
2015
Expected life in years
7.0

 
7.0

Volatility
28.9
%
 
40.7
%
Interest rate
1.7
%
 
2.0
%
Yield rate
0.7
%
 
0.4
%