CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
CONDENSED CONSOLIDATED STATEMENTS COMPREHENSIVE INCOME (LOSS)
Revenue, net	$ 2,064	$ 1,702	$ 3,632	$ 3,393
Cost of revenue	937	704	1,631	1,436
Gross profit	1,127	998	2,001	1,957
Operating expenses:
Engineering, research and development	232	293	449	578
Selling, general and administrative	762	664	1,479	1,410
Total operating expenses	994	957	1,928	1,988
Income (loss) from operations	133	41	73	(31)
Other income (expense):
Other income (expense), net	(29)	(8)	(19)	(2)
Income (loss) before income taxes	104	33	54	(33)
Income tax expense (benefit)	41	20	34	(28)
Net income (loss)	$ 63	$ 13	$ 20	$ (5)
Earnings (loss) per share - basic	$ 0.01	$ 0.00	$ 0.00	$ 0.00
Earnings (loss) per share - diluted	$ 0.01	$ 0.00	$ 0.00	$ 0.00
Weighted average common shares outstanding - basic	6,601	6,580	6,601	6,571
Weighted average common shares outstanding - diluted	6,601	6,580	6,601	6,571
Earnings (loss) per share - basic and diluted	$ 0.01	$ 0.00	$ 0.00	$ 0.00
Weighted average common shares outstanding - basic and diluted	6,601	6,580	6,601	6,571