Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue	$ 15,206	$ 13,355	$ 39,490	$ 22,267
Cost of revenue	7,937	5,558	15,393	9,986
Expenses
Marketing	85	46	151	83
General and administrative	1,255	1,241	2,940	2,121
Research and development	2,463	2,652	5,787	4,754
Income from operations	3,466	3,858	15,219	5,323
Investment income (loss)	260	(134)	157	(267)
Other income	29	81	66	156
Income before income taxes	3,755	3,805	15,442	5,212
Income taxes	899	1,000	3,916	1,367
Net income	$ 2,856	$ 2,805	$ 11,526	$ 3,845
Basic (in dollars per share)	$ 0.33	$ 0.32	$ 1.34	$ 0.43
Diluted (in dollars per share)	$ 0.33	$ 0.32	$ 1.33	$ 0.43
Basic weighted average common shares outstanding (in shares)	8,595,478	8,797,691	8,625,504	8,848,351
Diluted weighted average common shares outstanding (in shares)	8,616,354	8,828,773	8,651,874	8,880,831
Service [Member]
Revenue	$ 13,412	$ 11,055	$ 25,207	$ 19,967
Cost of revenue	7,937	5,558	15,393	9,986
Product [Member]
Revenue	$ 1,794	$ 2,300	$ 14,283	$ 2,300