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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net sales	$ 124,243	$ 118,217	$ 112,035
Cost of sales	85,280	79,946	77,210
Gross margin	38,963	38,271	34,825
Selling, general and administrative expense	21,297	20,460	19,590
Operating income	17,666	17,811	15,235
Interest income	3,270	2,664	1,929
Income before income taxes	20,936	20,475	17,164
Provision for income taxes	4,938	5,150	3,961
Net income	$ 15,998	$ 15,325	$ 13,203
Basic and diluted earnings per common share	$ 1.29	$ 1.23	$ 1.06
Basic and diluted weighted average shares outstanding	12,440	12,432	12,423

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