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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Net sales	$ 32,385	$ 30,002	$ 60,798	$ 59,950
Cost of goods sold	21,150	20,494	40,061	40,756
Gross profit	11,235	9,508	20,737	19,194
Selling, general and administrative expense	5,251	4,907	10,380	10,068
Operating income	5,984	4,601	10,357	9,126
Interest income	640	482	1,212	817
Income before taxes	6,624	5,083	11,569	9,943
Provision for income taxes	1,627	1,780	2,846	3,489
Net income	$ 4,997	$ 3,303	$ 8,723	$ 6,454
Basic and diluted net income per common share	$ 0.40	$ 0.27	$ 0.70	$ 0.52
Cash dividends per share	$ 0.05	$ 0.05	$ 0.10	$ 0.10
Basic and diluted weighted average shares outstanding	12,430	12,422	12,428	12,421

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