Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue
Total net revenue	$ 8,912	$ 7,893
Cost of revenue
Total cost of revenue	4,429	3,506
Expenses
Marketing	37	32
General and administrative	880	1,058
Research and development	2,101	918
Income from operations	1,465	2,379
Investment income (loss)	(133)	(1,050)
Other income, net	75	136
Income before income taxes	1,407	1,465
Income taxes	367	418
Net income	$ 1,040	$ 1,047
Earnings per share:
Basic (in dollars per share)	$ 0.12	$ 0.12
Diluted (in dollars per share)	$ 0.12	$ 0.12
Basic weighted average common shares outstanding (in shares)	8,899,011	8,924,988
Diluted weighted average common shares outstanding (in shares)	8,933,090	9,021,754
Service [Member]
Revenue
Total net revenue	$ 8,912	$ 7,893
Cost of revenue
Total cost of revenue	4,429	3,506
Product [Member]
Revenue
Total net revenue
Cost of revenue
Total cost of revenue