Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net Sales	$ 40,670	$ 24,851	$ 76,553	$ 55,402
Cost of sales	13,909	7,822	25,993	17,890
Gross profit	26,761	17,029	50,560	37,512
Sales and marketing	6,803	4,686	13,269	12,631
General and administrative	6,200	5,332	12,744	10,523
Research and development	2,652	2,139	5,496	5,133
Total operating expenses	15,655	12,157	31,509	28,287
Income from operations	11,106	4,872	19,051	9,225
Other income (expense):
Interest income	1	74	2	179
Interest expense	(495)	(66)	(1,072)	(66)
Foreign currency gain (loss)	(157)	(113)	(33)	(291)
Income before income taxes	10,455	4,767	17,948	9,047
Provision for income taxes	2,156	1,267	3,720	2,373
Net income	$ 8,299	$ 3,500	$ 14,228	$ 6,674
Earnings per share of common stock:
Basic (in dollars per share)	$ 0.40	$ 0.17	$ 0.69	$ 0.33
Diluted (in dollars per share)	$ 0.40	$ 0.17	$ 0.68	$ 0.33
Weighted-average shares outstanding:
Basic (in shares)	20,611	20,180	20,579	20,174
Diluted (in shares)	20,959	20,399	20,900	20,415
Cash dividends declared per common share (in dollars per share)	$ 0.110	$ 0.095	$ 0.220	$ 0.190