Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues	$ 42,674	$ 39,701	$ 38,980
Cost of revenues	22,056	19,879	17,530
Gross profit	20,618	19,822	21,450
Operating Expenses:
General & administrative	6,430	5,642	4,965
Marketing & selling	5,027	4,666	4,960
Research & development	1,551	1,357	1,415
Total Operating Expenses	13,008	11,665	11,340
Operating income	7,610	8,157	10,110
Other income (expense)	43	20	(134)
Net income before provision for income taxes	7,653	8,177	9,976
Provision for income taxes	3,069	2,056	3,298
Net income	4,584	6,121	6,678
Other Comprehensive Income (Loss):
Foreign currency translation	(1,161)	(238)
Total Comprehensive Income	$ 3,423	$ 5,883	$ 6,678
Basic net income per share (in dollars per share)	$ 0.83	$ 1.12	$ 1.23
Diluted net income per share (in dollars per share)	0.83	1.10	1.22
Dividends declared per share (in dollars per share)	$ 0.69	$ 0.60	$ 0.60
Weighted average common shares outstanding:
Weighted average common shares outstanding, basic (in shares)	5,502	5,480	5,447
Diluted (in shares)	5,547	5,540	5,475