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Stock-Based Compensation (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	282,900	363,200
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	36 months	36 months
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	188,000	261,600
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value	$ 3.70	$ 3.38
Allocated Share-based Compensation Expense, Net of Tax	$ 541,704	$ 463,881
Number of Shares Subject to Option, Granted	80,200
Stock or Unit Option Plan Expense	173,120
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	33 months
Unamortised Option Based Compensation Costs	1,330,221
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	91,500	96,500
Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	3,400	5,100
Consultant [Member]
Allocated Share-based Compensation Expense, Net of Tax	$ (1,193)	$ (12,143)
Consultant [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	60 months
Consultant [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	24 months

X

- Definition

Sum of the carrying amounts as of the balance sheet date of unamortised compensation costs capitalized at the end of the reporting period that are expected to be recognised.

+ References

No definition available.

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- Definition

The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

No definition available.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Topic 718

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(c)

-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.

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- Definition

The intrinsic value of equity-based payment equity instruments, excluding stock or unit options, granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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-Publisher FASB

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

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- Definition

Number of share instruments newly issued under a share-based compensation plan.

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-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.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Number 123R

-Paragraph A240

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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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-Name Accounting Standards Codification

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-Number 123R

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-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.



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