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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, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Numerator:                      
Net income attributable to common shareholders $ 1,805,500 $ 1,869,494 $ 1,744,290 $ 423,208 $ 911,665 $ 1,847,412 $ 2,177,619 $ 721,160 $ 5,842,492 $ 5,657,856 $ 2,456,680
Denominator:                      
Weighted-average shares outstanding – basic (in shares)                 19,564,625 20,342,913 20,333,932
Dilutive effect of restricted stock and stock options (in shares)                 222,912 229,219 724,645
Weighted-average shares outstanding – diluted (in shares)                 19,787,537 20,572,132 21,058,577