Supplementary Financial Information (Unaudited) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Supplementary Financial Information (Unaudited) [Abstract]
Net revenues	$ 10,802,370	$ 16,731,568	$ 14,848,077	$ 9,881,038	$ 10,263,711	$ 15,046,958	$ 13,784,714	$ 9,374,454	$ 52,263,053	$ 48,469,837
Operating expenses	9,207,288	15,344,057	13,879,109	9,218,732	8,673,352	13,982,105	13,032,832	8,681,623	47,649,186	44,369,912
Net income	$ 953,633	$ 813,059	$ 571,650	$ 388,680	$ 938,908	$ 623,306	$ 442,934	$ 406,007	$ 2,727,022	$ 2,411,155
Basic net income per share	$ 0.22	$ 0.19	$ 0.14	$ 0.09	$ 0.22	$ 0.15	$ 0.11	$ 0.10	$ 0.65	$ 0.58
Diluted net income per share	$ 0.22	$ 0.19	$ 0.14	$ 0.09	$ 0.22	$ 0.15	$ 0.11	$ 0.10	$ 0.64	$ 0.57