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Earnings Per Share (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Computation for earnings per share    
Net income $ 5,330,733 $ 4,611,353
Weighted average number of outstanding shares 3,197,476 3,030,834
Earnings per share $ 1.67 $ 1.52