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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net sales	$ 33,730	$ 32,385	$ 64,907	$ 60,798
Cost of goods sold	22,791	21,150	44,344	40,061
Gross profit	10,939	11,235	20,563	20,737
Selling, general and administrative expense	5,317	5,251	10,650	10,380
Operating income	5,622	5,984	9,913	10,357
Interest income	828	640	1,664	1,212
Income before taxes	6,450	6,624	11,577	11,569
Provision for income taxes	1,555	1,627	2,696	2,846
Net income	$ 4,895	$ 4,997	$ 8,881	$ 8,723
Basic and diluted net income per common share	$ 0.39	$ 0.40	$ 0.71	$ 0.70
Basic and diluted weighted average shares outstanding	12,439	12,430	12,437	12,428

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