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Earnings Per Share (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator:        
Net income attributable to common shareholders $ 405,998 $ 722,570 $ 452,279 $ 1,008,890
Denominator:        
Weighted-average shares outstanding – basic (in shares) 16,820,725 17,743,395 16,916,193 17,825,174
Dilutive effect of other securities (in shares) 363,620 282,518 377,894 268,217
Weighted-average shares outstanding – diluted (in shares) 17,184,345 18,025,913 17,294,087 18,093,391