Stock-Based Compensation (Details) - Stock Option Plan [Member] - USD ($)	6 Months Ended	12 Months Ended
Jun. 30, 2015	Dec. 31, 2014
Summary the stock option transactions
Number of Options, Outstanding	213,170
Number of Options, Exercised	(28,466)
Number of Options, Expired	(58,781)
Number of Options, Outstanding	125,923	213,170
Number of Options, Exercisable	125,923
Weighted Average Exercise Price, Outstanding	$ 31.79
Weighted Average Exercise Price, Exercised	27.29
Weighted Average Exercise Price, Expired	43.47
Weighted Average Exercise Price, Outstanding	27.36	$ 31.79
Weighted Average Exercise Price, Exercisable	$ 27.36
Weighted Average Remaining Contractual Term (Years), Outstanding	1 year	1 year 2 months 12 days
Weighted Average Remaining Contractual Term (Years), Exercisable	1 year
Aggregate Intrinsic Value, Outstanding	$ 2,519,147
Aggregate Intrinsic Value, Outstanding	1,321,078	$ 2,519,147
Aggregate Intrinsic Value, Exercisable	$ 1,321,078

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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-SubTopic 10

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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