SUPPLEMENTARY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Selected Quarterly Financial Information [Abstract]
Net revenues	$ 12,038,389	$ 18,370,511	$ 16,512,724	$ 12,219,946	$ 11,996,389	$ 17,666,841	$ 15,846,475	$ 11,443,071	$ 59,142,000	$ 56,953,000
Operating expenses	8,779,324	16,338,866	15,513,258	10,863,193	11,065,012	16,130,028	14,655,317	10,581,262	51,494,641	52,431,619
Net income	$ 2,370,558	$ 1,632,845	$ 725,351	$ 989,690	$ 1,908,576	$ 952,635	$ 716,573	$ 512,997	$ 5,718,444	$ 4,090,781
Basic net income per share	$ 0.52	$ 0.36	$ 0.16	$ 0.22	$ 0.43	$ 0.22	$ 0.16	$ 0.12	$ 1.28	$ 0.93
Diluted net income per share	$ 0.52	$ 0.36	$ 0.16	$ 0.22	$ 0.43	$ 0.22	$ 0.16	$ 0.12	$ 1.26	$ 0.93