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QUARTERLY FINANCIAL INFORMATION (Details) - USD ($) $ / shares in Units, $ in Thousands		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
Total revenue		$ 9,337	$ 8,131	$ 7,573	$ 6,876	$ 8,134	$ 6,820	$ 5,042	$ 3,436	$ 31,917	$ 23,432
Less: cost of revenue and operating expenses		6,457	5,311	4,858	4,921	4,542	3,885	3,108	2,953	21,547	14,488
Income from operations		2,880	2,820	2,715	1,955	3,592	2,935	1,934	483	10,370	8,944
Income before income taxes		2,880	2,819	2,678	1,840	3,348	2,244	1,540	362
Net income		$ 2,622	$ 2,591	$ 2,418	$ 1,921	$ 3,308	$ 2,200	$ 1,504	$ 353	$ 9,552	$ 7,365
Net income per common share:
Basic income per common share - net income	[1]	$ 0.08	$ 0.08	$ 0.07	$ 0.06	$ 0.10	$ 0.07	$ 0.05	$ 0.01
Diluted income per common share - net income	[1]	$ 0.08	$ 0.07	$ 0.07	$ 0.06	$ 0.10	$ 0.07	$ 0.05	$ 0.01
[1] Sum of quarterly amounts may not equal year-to-date amounts due to rounding.

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