CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Revenue, net	$ 7,478	$ 6,888
Cost of revenue	3,420	2,986
Gross profit	4,058	3,902
Operating expenses:
Engineering, research and development	893	918
Selling, general and administrative	3,244	2,874
Total operating expenses	4,137	3,792
Income (loss) from operations	(79)	110
Other income (expense):
Other income (expense), net	(50)	(92)
Income (loss) before income taxes	(129)	18
Income tax expense (benefit)	605	(95)
Net income (loss)	(734)	113
Net income (loss) applicable to common stockholders	$ (782)	$ 113
Earnings (loss) per common share, basic	$ (0.12)	$ 0.02
Earnings (loss) per common share, diluted	$ (0.12)	$ 0.02
Weighted average common shares outstanding - basic	6,601	6,586
Weighted average common shares outstanding - diluted	6,601	6,599