CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenues	$ 20,820,000	$ 12,391,000	$ 53,245,000	$ 42,411,000
Cost of revenues	12,125,000	6,885,000	29,953,000	23,290,000
Gross margin	8,695,000	5,506,000	23,292,000	19,121,000
Research and development expenses	2,403,000	2,408,000	6,980,000	6,950,000
Selling, general and administrative expenses	4,082,000	3,855,000	11,900,000	11,779,000
Income (loss) from operations	2,210,000	(757,000)	4,412,000	392,000
Interest income and other	(2,000)	170,000	326,000	306,000
Income (loss) before income taxes	2,208,000	(587,000)	4,738,000	698,000
Income tax expense (benefit)	409,000	(234,000)	462,000	92,000
Net income (loss)	$ 1,799,000	$ (353,000)	$ 4,276,000	$ 606,000
Net income (loss) per share – Basic	$ 0.25	$ (0.05)	$ 0.59	$ 0.09
Net income (loss) per share – Diluted	$ 0.24	$ (0.05)	$ 0.57	$ 0.08
Weighted average shares outstanding – Basic	7,240	7,117	7,198	7,108
Weighted average shares outstanding – Diluted	7,519	7,117	7,445	7,245