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Earnings Per Share (Schedule of Computation of Numerator and Denominator in Earnings Per Share) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Numerator:                      
Net income (loss) attributable to common shareholders $ (1,500,363) $ (819,942) $ (639,018) $ 854,709 $ 1,805,500 $ 1,869,494 $ 1,744,290 $ 423,208 $ (2,104,614) $ 5,842,492 $ 5,657,856
Denominator:                      
Weighted-average shares outstanding – basic (in shares)                 18,332,997 19,564,625 20,342,913
Dilutive effect of restricted stock and stock options (in shares)                 0 222,912 229,219
Weighted-average shares outstanding – diluted (in shares)                 18,332,997 19,787,537 20,572,132