Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue:
Total Revenue	$ 2,752	$ 2,979
Cost of revenue:
Total Cost of revenue	616	706
Gross profit	2,136	2,273
Operating expenses:
Selling, general and administrative	1,687	1,366
Research and development	428	496
Total Operating expenses	2,115	1,862
Income from operations	21	411
Other income	11	925
Investment income	5	0
Interest income (expense)	(18)	0
Income from operations before income taxes	19	1,336
Income tax expense	2	205
Net income	$ 17	$ 1,131
Net income per share:
Basic (in dollars per share)	$ 0	$ 0.21
Diluted (in dollars per share)	$ 0	$ 0.21
Weighted average number of common shares outstanding:
Basic (in shares)	5,362	5,322
Diluted (in shares)	5,377	5,342
Product sales [Member]
Revenue:
Total Revenue	$ 934	$ 1,163
Cost of revenue:
Total Cost of revenue	511	613
Royalties [Member]
Revenue:
Total Revenue	1,818	1,816
Cost of revenue:
Total Cost of revenue	$ 105	$ 93