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Earnings Per Share (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Numerator:    
Net income attributable to common shareholders $ 854,709 $ 423,208
Denominator:    
Weighted-average shares outstanding – basic (in shares) 18,758,383 20,007,998
Dilutive effect of other securities (in shares) 166,782 226,440
Weighted-average shares outstanding – diluted (in shares) 18,925,165 20,234,438