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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2012
Stock-Based Compensation [Abstract] |
Schedule of Assumptions used to Estimate Fair Value of Share-Based Payments [Table Text Block] |
|  | Six Months Ended June 30, |
|  | 2012 |  |  | 2011 |
Weighted average fair value of grants |  | $ | 2.03 |  |  | $ | 1.89 |
Risk-free interest rate |  |  | 2.03 | % |  |  | 2.19 | %
Dividend yield |  |  | 1.24 | % |  |  | 1.32 | %
Expected volatility |  |  | 22.04 | % |  |  | 22.25 | %
Expected life in months |  |  | 68 |  |  |  | 65 |
Schedule of Activity and Changes Under the Principal Option Plan [Table Text Block] |
|  | Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2011 |  |  | 171,378 |  |  | $ | 10.01 |  |  |  |  |  |  |
Granted |  |  | 27,784 |  |  |  | 9.64 |  |  |  |  |  |  |
Exercised |  |  | 14,761 |  |  |  | 8.89 |  |  |  |  |  |  |
Outstanding at June 30, 2012 |  |  | 184,401 |  |  |  | 10.04 |  |  |  | 6.48 |  |  | $ | 282,988 |
Exercisable at June 30, 2012 |  |  | 115,813 |  |  | $ | 10.61 |  |  |  | 5.16 |  |  | $ | 134,131 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65, A240 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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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