Supplementary Financial Information (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
Supplementary Financial Information [Abstract]
Net revenues	$ 10,263,711	$ 15,046,958	$ 13,784,714	$ 9,374,454	$ 10,036,460	$ 14,274,459	$ 13,280,950	$ 9,144,568	$ 48,469,837	$ 46,736,437
Operating expenses	8,673,352	13,982,105	13,032,832	8,681,623	9,415,308	13,999,754	12,948,626	8,638,940	44,369,912	45,002,628
Net income	$ 938,908	$ 623,306	$ 442,934	$ 406,007	$ 361,880	$ 170,503	$ 193,248	$ 291,081	$ 2,411,155	$ 1,016,712
Basic net income per share	$ 0.22	$ 0.15	$ 0.11	$ 0.10	$ 0.09	$ 0.04	$ 0.05	$ 0.07	$ 0.58	$ 0.24
Diluted net income per share	$ 0.22	$ 0.15	$ 0.11	$ 0.10	$ 0.09	$ 0.04	$ 0.05	$ 0.07	$ 0.57	$ 0.24