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Quarterly Financial Information (Schedule of Quarterly Financial Information (Unaudited)) (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
Quarterly Financial Information Disclosure [Abstract]                      
Net revenues $ 13,696,366 $ 12,531,719 $ 12,366,940 $ 10,256,212 $ 13,031,830 $ 13,054,278 $ 14,389,741 $ 10,666,927 $ 48,851,237 $ 51,142,776 $ 45,876,371
Operating income 3,252,993 2,979,163 1,939,931 646,015 1,711,269 3,098,360 3,631,857 1,408,001 8,818,102 9,849,487 6,501,747
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
Earnings per share attributable to common shareholders (1)                      
Basic (in USD per share) $ 0.09 [1] $ 0.10 [1] $ 0.09 [1] $ 0.02 [1] $ 0.05 [1] $ 0.09 [1] $ 0.11 [1] $ 0.04 [1] $ 0.30 $ 0.28 $ 0.12
Diluted (in USD per share) $ 0.09 [1] $ 0.10 [1] $ 0.09 [1] $ 0.02 [1] $ 0.04 [1] $ 0.09 [1] $ 0.11 [1] $ 0.03 [1] $ 0.30 $ 0.28 $ 0.12
[1] Due to the nature of interim earnings per share calculations, the sum of the quarterly earnings per share amounts may not equal the reported earnings per share for the full year.