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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CONDENSED CONSOLIDATED STATEMENTS COMPREHENSIVE INCOME (LOSS)
Revenue, net	$ 1,568	$ 1,691
Cost of revenue	694	732
Gross profit	874	959
Operating expenses:
Engineering, research and development	217	285
Selling, general and administrative	717	746
Total operating expenses	934	1,031
(Loss) from operations	(60)	(72)
Other income (expense):
Other income (expense), net	10	6
(Loss) before income taxes	(50)	(66)
Income tax (benefit)	(7)	(48)
Net (loss)	$ (43)	$ (18)
Earnings (loss) per share - basic and diluted	$ (0.01)	$ 0.00
Weighted average common shares outstanding - basic and diluted	6,601	6,563

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