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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenue	$ 77,205	$ 68,578	$ 223,556	$ 212,067
Cost of sales	19,022	16,415	54,870	53,485
Gross profit	58,183	52,163	168,686	158,582
Selling, general, and administrative	47,956	43,210	138,540	138,337
Income from operations	10,227	8,953	30,146	20,245
Other income (expense)
Interest income, net	148	60	352	240
Other income (expense)	(4)	(2)	32	(23)
Nonoperating income (expense)	144	58	384	217
Income from operations before income taxes	10,371	9,011	30,530	20,462
Provision for income taxes	3,685	2,946	10,115	6,740
Net income	$ 6,686	$ 6,065	$ 20,415	$ 13,722
Basic earnings (loss) per share
Earnings per share - basic	$ 0.56	$ 0.51	$ 1.71	$ 1.16
Diluted earnings (loss) per share
Earnings per share - diluted	$ 0.55	$ 0.51	$ 1.69	$ 1.15
Weighted average shares outstanding -
Basic	11,930	11,848	11,920	11,839
Diluted	12,095	11,948	12,063	11,925
Cash dividends declared per share	$ 0.32	$ 0.25	$ 0.96	$ 0.75

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