CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
CONDENSED CONSOLIDATED STATEMENTS COMPREHENSIVE INCOME (LOSS)
Revenue, net	$ 2,223	$ 1,548	$ 5,855	$ 4,941
Cost of revenue	931	737	2,562	2,173
Gross profit	1,292	811	3,293	2,768
Operating expenses:
Engineering, research and development	105	208	554	786
Selling, general and administrative	928	682	2,407	2,092
Total operating expenses	1,033	890	2,961	2,878
Income (loss) from operations	259	(79)	332	(110)
Other income (expense):
Other income (expense), net	(6)	(41)	(25)	(43)
Income (loss) before income taxes	253	(120)	307	(153)
Income tax expense (benefit)	30	(185)	64	(213)
Net income	$ 223	$ 65	$ 243	$ 60
Earnings per share - basic and diluted	$ 0.03	$ 0.01	$ 0.04	$ 0.01
Weighted average common shares outstanding - basic	6,602	6,601	6,601	6,581
Weighted average common shares outstanding - diluted	6,602	6,601	6,601	6,598