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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Net sales	$ 30,029	$ 26,992	$ 90,827	$ 86,943
Cost of goods sold	20,435	18,794	60,494	59,552
Gross profit	9,594	8,198	30,333	27,391
Selling, general and administrative expense	5,074	4,830	15,454	14,897
Operating income	4,520	3,368	14,879	12,494
Interest income	697	546	1,908	1,363
Income before taxes	5,217	3,914	16,787	13,857
Provision for income taxes	1,286	1,418	4,132	4,906
Net income	$ 3,931	$ 2,496	$ 12,655	$ 8,951
Basic and diluted net income per common share	$ 0.32	$ 0.20	$ 1.02	$ 0.72
Cash dividends per share	$ 0.05	$ 0.05	$ 0.15	$ 0.15
Basic and diluted weighted average shares outstanding	12,436	12,426	12,431	12,422

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