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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net sales	$ 118,217	$ 112,035	$ 108,920
Cost of goods sold	79,946	77,210	73,753
Gross profit	38,271	34,825	35,167
Selling, general and administrative expense	20,460	19,590	19,593
Operating income	17,811	15,235	15,574
Interest income	2,664	1,929	390
Income before income taxes	20,475	17,164	15,964
Provision for income taxes	5,150	3,961	5,507
Net income	$ 15,325	$ 13,203	$ 10,457
Basic and diluted earnings per common share	$ 1.23	$ 1.06	$ 0.84
Cash dividends per share	$ 0.20	$ 0.20	$ 0.20
Basic and diluted weighted average shares outstanding	12,432	12,423	12,416

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