CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenues	$ 27,762,000	$ 20,820,000	$ 70,698,000	$ 53,245,000
Cost of revenues	15,033,000	12,125,000	38,481,000	29,953,000
Gross margin	12,729,000	8,695,000	32,217,000	23,292,000
Research and development expenses	2,648,000	2,403,000	8,162,000	6,980,000
Selling, general and administrative expenses	4,912,000	4,082,000	13,495,000	11,900,000
Income from operations	5,169,000	2,210,000	10,560,000	4,412,000
Interest income (expense) and other	143,000	(2,000)	203,000	326,000
Income before income taxes	5,312,000	2,208,000	10,763,000	4,738,000
Income tax expense	514,000	409,000	1,415,000	462,000
Net income	$ 4,798,000	$ 1,799,000	$ 9,348,000	$ 4,276,000
Net income per share – Basic	$ 0.66	$ 0.25	$ 1.28	$ 0.59
Net income per share – Diluted	$ 0.63	$ 0.24	$ 1.24	$ 0.57
Weighted average shares outstanding – Basic	7,324	7,240	7,305	7,198
Weighted average shares outstanding – Diluted	7,580	7,519	7,520	7,445