QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
Total Revenue	$ 14,162	$ 11,817	$ 10,297	$ 9,196	$ 9,337	$ 8,131	$ 7,573	$ 6,876	$ 45,472	$ 31,917
Less: cost of revenue and operating expenses	10,431	9,322	7,713	6,940	6,457	5,312	4,858	4,921	34,406	21,547
Income from operations	3,731	2,495	2,584	2,256	2,880	2,819	2,715	1,955	11,066	10,370
Income before income taxes	3,725	2,496	2,584	3,136	2,880	2,818	2,678	1,840
Net income	$ 2,947	$ 2,033	$ 2,162	$ 2,350	$ 2,622	$ 2,591	$ 2,418	$ 1,921	$ 9,492	$ 9,552
Net income per common share:
Basic income per share - net income	$ 0.09	$ 0.06	$ 0.07	$ 0.07	$ 0.08	$ 0.08	$ 0.07	$ 0.06
Diluted income per share - net income	$ 0.09	$ 0.06	$ 0.06	$ 0.07	$ 0.08	$ 0.07	$ 0.07	$ 0.06