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Quarterly Financial Information (Schedule of Quarterly Financial Information (Unaudited)) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]                      
Net revenues $ 9,329,412us-gaap_SalesRevenueNet $ 9,729,047us-gaap_SalesRevenueNet $ 9,750,168us-gaap_SalesRevenueNet $ 8,093,244us-gaap_SalesRevenueNet $ 8,159,667us-gaap_SalesRevenueNet $ 6,528,575us-gaap_SalesRevenueNet $ 7,081,088us-gaap_SalesRevenueNet $ 10,258,132us-gaap_SalesRevenueNet $ 36,901,871us-gaap_SalesRevenueNet $ 32,027,462us-gaap_SalesRevenueNet $ 48,851,237us-gaap_SalesRevenueNet
Operating income (loss) 946,138us-gaap_OperatingIncomeLoss 989,038us-gaap_OperatingIncomeLoss 1,215,609us-gaap_OperatingIncomeLoss 408,051us-gaap_OperatingIncomeLoss (2,472,077)us-gaap_OperatingIncomeLoss (1,514,768)us-gaap_OperatingIncomeLoss (1,140,544)us-gaap_OperatingIncomeLoss 1,326,051us-gaap_OperatingIncomeLoss 3,558,836us-gaap_OperatingIncomeLoss (3,801,338)us-gaap_OperatingIncomeLoss 8,818,102us-gaap_OperatingIncomeLoss
Net income (loss) attributable to common shareholders $ 668,913us-gaap_NetIncomeLoss $ 745,920us-gaap_NetIncomeLoss $ 722,570us-gaap_NetIncomeLoss $ 286,320us-gaap_NetIncomeLoss $ (1,500,363)us-gaap_NetIncomeLoss $ (819,942)us-gaap_NetIncomeLoss $ (639,018)us-gaap_NetIncomeLoss $ 854,709us-gaap_NetIncomeLoss $ 2,423,723us-gaap_NetIncomeLoss $ (2,104,614)us-gaap_NetIncomeLoss $ 5,842,492us-gaap_NetIncomeLoss
Earnings per share attributable to common shareholders (1)                      
Basic (in USD per share) $ 0.04us-gaap_EarningsPerShareBasic [1] $ 0.04us-gaap_EarningsPerShareBasic [1] $ 0.04us-gaap_EarningsPerShareBasic [1] $ 0.02us-gaap_EarningsPerShareBasic [1] $ (0.08)us-gaap_EarningsPerShareBasic [1] $ (0.04)us-gaap_EarningsPerShareBasic [1] $ (0.03)us-gaap_EarningsPerShareBasic [1] $ 0.05us-gaap_EarningsPerShareBasic [1] $ 0.14us-gaap_EarningsPerShareBasic [1] $ (0.11)us-gaap_EarningsPerShareBasic [1] $ 0.30us-gaap_EarningsPerShareBasic
Diluted (in USD per share) $ 0.04us-gaap_EarningsPerShareDiluted [1] $ 0.04us-gaap_EarningsPerShareDiluted [1] $ 0.04us-gaap_EarningsPerShareDiluted [1] $ 0.02us-gaap_EarningsPerShareDiluted [1] $ (0.08)us-gaap_EarningsPerShareDiluted [1] $ (0.04)us-gaap_EarningsPerShareDiluted [1] $ (0.03)us-gaap_EarningsPerShareDiluted [1] $ 0.05us-gaap_EarningsPerShareDiluted [1] $ 0.14us-gaap_EarningsPerShareDiluted [1] $ (0.11)us-gaap_EarningsPerShareDiluted [1] $ 0.30us-gaap_EarningsPerShareDiluted
[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.