Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net Sales	$ 38,368	$ 36,416	$ 114,921	$ 91,818
Cost of sales	13,502	13,712	39,495	31,602
Gross profit	24,866	22,704	75,426	60,216
Sales and marketing	6,941	5,157	20,210	17,788
General and administrative	6,004	5,901	18,748	16,425
Research and development	2,848	2,098	8,344	7,230
Gain on sale of building	0	(470)	0	(470)
Total operating expenses	15,793	12,686	47,302	40,973
Income from operations	9,073	10,018	28,124	19,243
Other income (expense):
Interest income	54	15	56	194
Interest expense	(621)	(665)	(1,693)	(732)
Foreign currency gain (loss)	(72)	10	(105)	(280)
Income before income taxes	8,434	9,378	26,382	18,425
Provision for income taxes	1,930	1,865	5,650	4,238
Net income	$ 6,504	$ 7,513	$ 20,732	$ 14,187
Earnings per share of common stock:
Basic (in dollars per share)	$ 0.30	$ 0.37	$ 0.99	$ 0.70
Diluted (in dollars per share)	$ 0.30	$ 0.37	$ 0.98	$ 0.69
Weighted-average shares outstanding:
Basic (in shares)	21,592	20,254	20,920	20,201
Diluted (in shares)	21,935	20,474	21,251	20,434
Cash dividends declared per common share (in dollars per share)	$ 0.110	$ 0.095	$ 0.330	$ 0.285