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Earnings (Loss) Per Share (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Numerator:        
Net income (loss) attributable to common shareholders $ 722,570 $ (639,018) $ 1,008,890 $ 215,691
Denominator:        
Weighted-average shares outstanding – basic (in shares) 17,743,395 18,405,522 17,825,174 18,580,891
Dilutive effect of other securities (in shares) 282,518 0 268,217 175,800
Weighted-average shares outstanding – diluted (in shares) 18,025,913 18,405,522 18,093,391 18,756,691