Repurchase of Common Stock (Details Textual) (USD $)
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12 Months Ended | ||
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Jun. 30, 2013
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Dec. 31, 2008
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Dec. 31, 2012
Share Repurchase Program [Member]
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Stock Repurchase Program, Number of Shares Authorized to be Repurchased | 1,000,000 | ||
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 72,000 | ||
Repurchase of common stock (in shares) | 9,000 | ||
Stock Repurchased During Period Shares Par Value | $ 3.26 |