Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net sales	$ 117,232	$ 105,568	$ 100,867
Cost of sales	37,379	31,629	30,170
Gross profit	79,853	73,939	70,697
Sales and marketing	30,339	27,318	25,948
General and administrative	19,055	17,689	17,010
Research and development	9,276	8,197	6,636
Gain on acquisitions and divestitures		(7,474)
Total operating expenses	58,670	45,730	49,594
Income from operations	21,183	28,209	21,103
Other income (expense):
Interest income	698	631	179
Interest expense		(2)	(21)
Foreign currency loss	(202)	(394)	(155)
Income before income taxes	21,679	28,444	21,106
Provision for income taxes	3,745	5,501	3,929
Net income	$ 17,934	$ 22,943	$ 17,177
Earnings per share of common stock:
Basic (in dollars per share)	$ 0.91	$ 1.18	$ 0.91
Diluted (in dollars per share)	$ 0.88	$ 1.13	$ 0.86
Weighted-average shares outstanding:
Basic (in shares)	19,813	19,426	18,961
Diluted (in shares)	20,326	20,242	20,033
Cash dividends declared per common share (in dollars per share)	$ 0.34	$ 0.28	$ 0.22