Treasury Stock (Details Textual) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended		12 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 22, 2008	Dec. 31, 2012 Repurchase One [Member]	Dec. 31, 2012 Repurchase Two [Member]	Jun. 30, 2013 Repurchase Three [Member]	Jun. 30, 2013 Repurchase Four [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased		2,000
Treasury stock acquired	$ 21		$ 3,222	$ 1,800	$ 7	$ 1,252
Treasury Stock Shares Acquired Cost Method			1,245	600	21	3,244
Repurchase Price (in dollar per share)				$ 3.00