Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue
Total net revenue	$ 12,935	$ 10,304	$ 35,202	$ 26,250
Cost of revenue
Total cost of revenue	6,104	4,217	16,091	11,418
Expenses
Marketing	97	31	179	94
General and administrative	1,069	936	3,190	2,698
Research and development	2,356	1,639	7,109	3,477
Income from operations	3,309	3,481	8,633	8,563
Investment income (loss)	53	(92)	(215)	(1,237)
Other income	74	59	230	312
Income before income taxes	3,436	3,448	8,648	7,638
Income taxes	902	653	2,269	1,596
Net income	$ 2,534	$ 2,795	$ 6,379	$ 6,042
Earnings per share:
Basic (in dollars per share)	$ 0.29	$ 0.31	$ 0.72	$ 0.68
Earnings per share (in dollars per share)	$ 0.29	$ 0.31	$ 0.72	$ 0.67
Basic weighted average common shares outstanding (in shares)	8,714,579	8,927,908	8,803,760	8,925,961
Diluted weighted average common shares outstanding (in shares)	8,744,818	9,022,996	8,835,427	9,021,314
Service [Member]
Revenue
Total net revenue	$ 11,152	$ 8,704	$ 31,119	$ 24,650
Cost of revenue
Total cost of revenue	6,104	4,217	16,091	11,418
Product [Member]
Revenue
Total net revenue	$ 1,783	$ 1,600	$ 4,083	$ 1,600