CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenues	$ 25,204,000	$ 15,996,000	$ 42,936,000	$ 32,425,000
Cost of revenues	14,095,000	8,682,000	23,448,000	17,828,000
Gross margin	11,109,000	7,314,000	19,488,000	14,597,000
Research and development expenses	2,753,000	2,182,000	5,514,000	4,577,000
Selling, general and administrative expenses	4,695,000	3,659,000	8,583,000	7,818,000
Income from operations	3,661,000	1,473,000	5,391,000	2,202,000
Interest income and other	38,000	64,000	60,000	328,000
Income before income taxes	3,699,000	1,537,000	5,451,000	2,530,000
Income tax expense	590,000	(96,000)	901,000	53,000
Net income	$ 3,109,000	$ 1,633,000	$ 4,550,000	$ 2,477,000
Net income per share – Basic	$ 0.43	$ 0.23	$ 0.62	$ 0.35
Net income per share – Diluted	$ 0.41	$ 0.22	$ 0.61	$ 0.33
Weighted average shares outstanding – Basic	7,299	7,198	7,296	7,177
Weighted average shares outstanding – Diluted	7,517	7,447	7,490	7,407