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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net sales	$ 29,703	$ 30,029	$ 94,610	$ 90,827
Cost of sales	20,227	20,435	64,571	60,494
Gross margin	9,476	9,594	30,039	30,333
Selling, general and administrative expense	5,210	5,074	15,860	15,454
Operating income	4,266	4,520	14,179	14,879
Interest income	848	697	2,512	1,908
Income before taxes	5,114	5,217	16,691	16,787
Provision for income taxes	1,227	1,286	3,923	4,132
Net income	$ 3,887	$ 3,931	$ 12,768	$ 12,655
Basic and diluted net income per common share	$ 0.31	$ 0.32	$ 1.03	$ 1.02
Basic and diluted weighted average shares outstanding	12,443	12,436	12,439	12,431

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