Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenue
Total net revenue	$ 35,873	$ 34,303
Cost of revenue
Total cost of revenue	15,427	11,759
Expenses
Marketing	132	151
General and administrative	3,866	3,495
Research and development	5,153	5,516
Income from operations	11,295	13,382
Investment income (loss)	(1,044)	34
Other income	378	99
Income before income taxes	10,629	13,515
Income taxes	2,468	2,546
Net income	$ 8,161	$ 10,969
Earnings per share:
Basic (in dollars per share)	$ 0.91	$ 1.24
Diluted (in dollars per share)	$ 0.91	$ 1.22
Basic weighted average common shares outstanding (in shares)	8,919,602	8,873,071
Diluted weighted average common shares outstanding (in shares)	9,014,985	8,967,901
Service [Member]
Revenue
Total net revenue	$ 32,273	$ 28,578
Cost of revenue
Total cost of revenue	15,427	11,759
Product [Member]
Revenue
Total net revenue	3,600	5,725
Cost of revenue
Total cost of revenue