CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Revenue, net	$ 2,040	$ 2,064	$ 4,031	$ 3,632
Cost of revenue	1,088	937	1,838	1,631
Gross profit	952	1,127	2,193	2,001
Operating expenses:
Engineering, research and development	330	232	593	449
Selling, general and administrative	773	762	1,733	1,479
Total operating expenses	1,103	994	2,326	1,928
Income (loss) from operations	(151)	133	(133)	73
Other income (expense):
Other income (expense), net	342	(29)	497	(19)
Income before income taxes	191	104	364	54
Income tax expense	79	41	110	34
Net income	112	63	254	20
Net income applicable to common stockholders	$ 12	$ 63	$ 54	$ 20
Earnings per common share, basic	$ 0.00	$ 0.01	$ 0.01	$ 0.00
Earnings per common share, diluted	$ 0.00	$ 0.01	$ 0.01	$ 0.00
Weighted average common shares outstanding - basic	6,602	6,601	6,602	6,601
Weighted average common shares outstanding - diluted	6,602	6,601	6,602	6,601