SELECTED QUARTERLY DATA (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	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Net revenues	$ 6,620,648	$ 6,882,160	$ 6,180,156	$ 6,567,991	$ 6,138,867	$ 6,289,839	$ 4,714,975	$ 5,606,454	$ 26,250,955	$ 22,750,135	$ 14,044,624
Operating profit	4,311,777	4,725,885	3,833,596	4,155,158	3,894,516	4,321,958	2,662,974	3,563,867	17,026,416	14,443,315	6,966,927
Net income	$ 2,916,807	$ 3,053,593	$ 2,572,715	$ 2,829,124	$ 2,658,549	$ 2,870,979	$ 1,757,204	$ 2,330,900	$ 11,372,239	$ 9,617,632	$ 4,645,960
Basic earnings per share (in dollars per share)	$ 0.41	$ 0.43	$ 0.37	$ 0.40	$ 0.38	$ 0.42	$ 0.26	$ 0.35	$ 1.61	$ 1.41	$ 0.72
Diluted earnings per share (in dollars per share)	$ 0.40	$ 0.42	$ 0.35	$ 0.39	$ 0.36	$ 0.39	$ 0.24	$ 0.32	$ 1.56	$ 1.32	$ 0.66