Earnings Per Share (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Earnings per share (Textual) [Abstract]
Average number of shares outstanding	11,093,397	11,466,948	11,134,834	11,467,044
Number of shares outstanding	11,056,933		11,056,933		11,309,365