Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements Of Comprehensive Income [Abstract]
Net Sales	$ 7,636	$ 7,041
Cost of Goods Sold	3,410	2,955
Gross Profit	4,226	4,086
Operating Expenses
Selling and marketing	1,558	1,556
General and administrative	1,625	1,329
Research and development	753	810
Total Operating Expenses	3,936	3,695
Operating Income	290	391
Non-operating Income (Expense)
Interest expense	(11)	(17)
Gain on sale of available-for-sale securities	1,449	1,163
Interest income	0	2
Other income	16	15
Total Non-operating Income, Net	1,454	1,163
Income before Income Taxes	1,744	1,554
Income taxes	530	460
Net Income	1,214	1,094
Other Comprehensive Loss
Change in unrealized value of available-for-sale securities, net of income tax	131	(176)
Reclassification of gains included in net income, net of income tax	(898)	(721)
Other Comprehensive Loss	(767)	(897)
Net Comprehensive Income	$ 447	$ 197
Basic
Net income per share	$ 0.36	$ 0.32
Weighted average shares	3,395,521	3,395,510
Diluted
Net income per share	$ 0.33	$ 0.30
Weighted average shares	3,653,021	3,654,382