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Condensed Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Sales	$ 11,216	$ 15,108
Cost of goods sold	5,891	8,322
Gross profit	5,325	6,786
Operating expenses:
Research and development	2,418	2,338
Sales and marketing	1,539	2,274
General and administrative	2,678	1,995
Total operating expenses	6,635	6,607
Income (loss) from operations	(1,310)	179
Other expense (income):
Interest income	(124)	(188)
Interest expense		1
Total other income	(124)	(187)
Income (loss) before income taxes	(1,186)	366
Provision for income taxes	16	29
Net income (loss)	$ (1,202)	$ 337
Net income (loss) per share:
Basic	$ (0.12)	$ 0.03
Diluted	$ (0.12)	$ 0.03
Weighted average shares used in calculating income (loss) per share:
Basic	9,690	9,626
Diluted	9,690	9,961

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