Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue
Total net revenue	$ 10,304	$ 9,522	$ 26,250	$ 24,000
Cost of revenue
Total cost of revenue	4,217	3,012	11,418	8,445
Expenses
Marketing	31	35	94	124
General and administrative	936	700	2,698	2,394
Research and development	1,639	1,575	3,477	3,634
Income from operations	3,481	4,200	8,563	9,403
Investment income (loss)	(92)	(109)	(1,237)	(105)
Other income (loss)	59	104	312	353
Income before Income taxes	3,448	4,195	7,638	9,651
Income taxes	653	1,103	1,596	2,379
Net income	$ 2,795	$ 3,092	$ 6,042	$ 7,272
Basic (in dollars per share)	$ 0.31	$ 0.35	$ 0.68	$ 0.82
Diluted (in dollars per share)	$ 0.31	$ 0.34	$ 0.67	$ 0.81
Basic weighted average common shares outstanding (in shares)	8,927,908	8,886,321	8,925,961	8,859,544
Diluted weighted average common shares outstanding (in shares)	9,022,996	9,013,459	9,021,314	8,977,501
Service [Member]
Revenue
Total net revenue	$ 8,704	$ 7,297	$ 24,650	$ 20,275
Cost of revenue
Total cost of revenue	4,217	3,012	11,418	8,445
Product [Member]
Revenue
Total net revenue	1,600	2,225	1,600	3,725
Cost of revenue
Total cost of revenue