Supplementary Financial Information (Unaudited) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Supplementary Financial Information (Unaudited) [Abstract]
Net revenues	$ 11,550,492	$ 16,630,408	$ 13,885,992	$ 10,393,311	$ 10,802,370	$ 16,731,568	$ 14,848,077	$ 9,881,038	$ 52,460,203	$ 52,263,053
Operating expenses	10,388,683	15,071,503	9,988,467	9,870,318	9,207,288	15,344,057	13,879,109	9,218,732	45,318,971	47,649,186
Net income	$ 684,491	$ 925,837	$ 2,274,900	$ 310,752	$ 953,633	$ 813,059	$ 571,650	$ 388,680	$ 4,195,980	$ 2,727,022
Basic net income per share	$ 0.16	$ 0.22	$ 0.53	$ 0.07	$ 0.22	$ 0.19	$ 0.14	$ 0.09	$ 0.98	$ 0.65
Diluted net income per share	$ 0.16	$ 0.21	$ 0.53	$ 0.07	$ 0.22	$ 0.19	$ 0.14	$ 0.09	$ 0.97	$ 0.64