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Earnings Per Common Share And Share Awards (Tables)
 9 Months Ended
Sep. 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 nine-month periods ended September 30:
 
Three Months Ended September 30,
Nine Months Ended September 30,
 
2016
 
2015
2016
 
2015
Net income attributable to the Company
$
8,126,939

 
$
4,490,962

$
14,470,359

 
$
10,337,583

Weighted average common shares outstanding – Basic
1,888,870

 
1,967,923

1,915,468

 
1,995,120

Incremental shares outstanding assuming the exercise of dilutive stock options and SARs (share-settled)
6,722

 
4,310

6,531

 
4,923

Weighted average common shares outstanding – Diluted
1,895,592

 
1,972,233

1,921,999

 
2,000,043

Basic earnings per common share
$
4.30

 
$
2.28

$
7.55

 
$
5.18

Diluted earnings per common share
$
4.29

 
$
2.28

$
7.53

 
$
5.17
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 September 30, 2016
24,500

 
$
65.85

 
4.10
 
$
824,390

 
 
 
 
 
 
 
 
Exercisable as of September 30, 2016
22,250

 
$
63.02

 
3.85
 
$
811,723

 
 
 
 
 
 
 
 
Unvested as of September 30, 2016
2,250

 
$
93.87

 
6.63
 
$
12,667
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
%