CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenues	$ 16,683,000	$ 11,828,000	$ 46,657,000	$ 40,157,000
Cost of revenues	9,247,000	6,236,000	25,738,000	21,434,000
Gross margin	7,436,000	5,592,000	20,919,000	18,723,000
Research and development expenses	2,162,000	1,947,000	6,585,000	5,892,000
Selling, general and administrative expenses	3,935,000	3,793,000	12,413,000	11,821,000
Amortization of intangibles	10,000	15,000	35,000	50,000
Income (loss) from operations	1,329,000	(163,000)	1,886,000	960,000
Interest income and other	35,000	(25,000)	192,000	(141,000)
Income (loss) before income taxes	1,364,000	(188,000)	2,078,000	819,000
Income tax expense (benefit)	297,000	(116,000)	444,000	10,000
Net income (loss)	$ 1,067,000	$ (72,000)	$ 1,634,000	$ 809,000
Net income (loss) per share – Basic	$ 0.15	$ (0.01)	$ 0.23	$ 0.12
Net income (loss) per share – Diluted	$ 0.15	$ (0.01)	$ 0.23	$ 0.11
Weighted average shares outstanding – Basic	7,041	6,959	7,012	6,939
Weighted average shares outstanding – Diluted	7,299	6,959	7,176	7,041