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Repurchase of Common Stock (Details Textual) (USD $)
12 Months Ended
Jun. 30, 2013
Dec. 31, 2008
Dec. 31, 2012
Share Repurchase Program [Member]
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