Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Statements Of Comprehensive Income [Abstract]
Net Sales	$ 7,087	$ 7,636
Cost of Goods Sold	3,203	3,410
Gross Profit	3,884	4,226
Operating Expenses
Selling and marketing	1,576	1,558
General and administrative	1,371	1,625
Research and development	767	753
Total Operating Expenses	3,714	3,936
Operating Income	170	290
Non-operating Income (Expense)
Interest expense	(1)	(11)
Gain on sale of available-for-sale securities	0	1,449
Interest income	20	0
Other income	15	16
Total Non-operating Income, Net	34	1,454
Income before Income Taxes	204	1,744
Income taxes	2	530
Net Income	202	1,214
Other Comprehensive Income (Loss)
Change in unrealized value of available-for-sale securities, net of income tax	4	131
Reclassification of gains included in net income, net of income tax	0	(898)
Other Comprehensive Income (Loss)	4	(767)
Net Comprehensive Income	$ 206	$ 447
Basic
Net income per share	$ 0.06	$ 0.36
Weighted average shares	3,395,521	3,395,521
Diluted
Net income per share	$ 0.06	$ 0.36
Weighted average shares	3,395,945	3,395,521