Consolidated Income Statements and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Revenue	$ 65,645	$ 65,083
Cost of revenue	31,027	29,185
Gross profit	34,618	35,898
Operating expenses
Research and development	7,180	7,801
Selling, general and administrative	9,413	8,749
Total operating expenses	16,593	16,550
Income from operations	18,025	19,348
Other income - net	2,112	246
Income before income taxes	20,137	19,594
Income tax provision	2,328	1,931
Net income	$ 17,809	$ 17,663
Net income per share:
Basic	$ 0.97	$ 0.98
Diluted	$ 0.95	$ 0.95
Weighted-average shares outstanding used in computing net income per share:
Basic	18,316,464	18,108,369
Diluted	18,657,220	18,537,316
Comprehensive income:
Net income	$ 17,809	$ 17,663
Other comprehensive income, net of tax:
Unrealized gain (loss) on available-for-sale debt securities, net of tax (expense) benefit of ($ 44) and $32 for years ended December 31, 2023 and 2022, respectively	165	(121)
Comprehensive income	$ 17,974	$ 17,542