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Quarterly Financial Information (Schedule of Quarterly Financial Information (Unaudited)) (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Net revenues $ 11,649,288 $ 11,196,961 $ 8,667,127 $ 9,636,755 $ 9,081,440 $ 8,791,753 $ 7,414,835 $ 7,737,532 $ 41,150,131 $ 33,025,560 $ 33,519,051
Operating income (loss) (903,326) (839,349) (1,680,871) (657,802) (957,371) 130,132 (105,309) (500,583) (4,081,348) (1,433,131) 1,111,610
Net income (loss) attributable to common shareholders $ (800,545) $ (743,031) $ (5,160,611) $ (1,274,446) $ (749,694) $ 106,166 $ (48,044) $ (253,111) $ (7,978,633) $ (944,683) $ 731,351
Earnings per share attributable to common shareholders                      
Basic (in USD per share) $ (0.05) $ (0.05) $ (0.32) $ (0.08) $ (0.05) $ 0.01 $ 0.00 $ (0.02) $ (0.50) $ (0.06) $ 0.04
Diluted (in USD per share) $ (0.05) $ (0.05) $ (0.32) $ (0.08) $ (0.05) $ 0.01 $ 0.00 $ (0.02) $ (0.50) $ (0.06) $ 0.04