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Earnings Per Common Share And Share Awards (Tables) | 6 Months Ended
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Jun. 30, 2012
Earnings Per Common Share And Share Awards [Abstract] |
Computation Of Basic And Diluted Earnings Per Share |
|  | Three months ended |  | Six months ended
|  | June 30, |  | June 30,
|  | 2012 |  |  | 2011 |  | 2012 |  |  | 2011
Net income | $ | 3,349,488 | $ | 1,594,805 | $ | 4,781,627 | $ | 2,614,012
Weighted average common shares |  |  |  |  |  |  |  |  |  |
outstanding – Basic |  | 2,098,666 |  |  | 2,134,164 |  | 2,099,751 |  |  | 2,184,323
Incremental shares outstanding assuming |  |  |  |  |  |  |  |  |  |
the exercise of dilutive stock options |  |  |  |  |  |  |  |  |  |
and SARs (share settled) |  | 34,066 |  |  | 20,952 |  | 31,413 |  |  | 17,075
Weighted average common shares |  |  |  |  |  |  |  |  |  |
outstanding - Diluted |  | 2,132,732 |  |  | 2,155,116 |  | 2,131,164 |  |  | 2,201,398
Basic earnings per common share | $ | 1.60 |  | $ | 0.75 | $ | 2.28 |  | $ | 1.20
Diluted earnings per common share | $ | 1.57 |  | $ | 0.74 | $ | 2.24 |  | $ | 1.19
Summary Of Share-Based Award Transactions |
| Number Of Shares | Weighted Average Exercise Price | Average Remaining Contractual Term (years) | Aggregate Intrinsic Value
Outstanding as of January 1, 2011 | 110,800 |  | $ | 28.77 | 4.51 | $ | 353,955
SARs granted | 3,000 |  |  | 41.50 |  |  |
Options exercised | (7,700 | ) |  | 20.15 |  |  |
Options/SARs cancelled/forfeited/expired | (4,500 | ) |  | 28.61 |  |  |
Outstanding as of December 31, 2011 | 101,600 |  | $ | 29.81 | 3.91 | $ | 697,780
SARs granted | 3,000 |  |  | 50.50 |  |  |
Options exercised | (6,130 | ) |  | 24.93 |  |  |
Options/SARs cancelled/forfeited/expired | (70 | ) |  | 31.00 |  |  |
Outstanding as of June 30, 2012 | 98,400 |  | $ | 30.74 | 3.67 | $ | 2,576,857
Exercisable as of June 30, 2012 | 95,600 |  | $ | 30.28 | 3.61 | $ | 2,548,172
Unvested as of June 30, 2012 | 2,800 |  | $ | 46.69 | 5.94 | $ | 28,685
Weighted-Average Assumptions Of Fair Values For Stock Appreciation Rights |
| 2012 |  | 2011 |
Expected Life in Years | 5.0 |  | 5.0 |
Volatility | 44.6 | % | 43.6 | %
Interest Rate | 0.8 | % | 1.9 | %
Yield Rate | 0.6 | % | 0.8 | %

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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