Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Consolidated Statements Of Comprehensive Income (Loss) [Abstract]
Net Sales	$ 2,048	$ 1,760	$ 3,933	$ 3,462
Cost of Goods Sold	922	744	1,745	1,476
Gross Profit	1,126	1,016	2,188	1,986
Operating Expenses
Selling and marketing	411	399	818	788
General and administrative	399	293	805	644
Research and development	189	216	405	381
Total Operating Expenses	999	908	2,028	1,813
Operating Income	127	108	160	173
Non-operating Income (Expense)
Interest expense	(2)	(5)	(6)	(7)
Gain on sale of available-for-sale securities	634	203	1,449	750
Interest income	1	1	2	2
Other income	4	4	7	8
Total Non-operating Income, Net	637	203	1,452	753
Income before Income Taxes	764	311	1,612	926
Income taxes	268	109	563	324
Net Income	496	202	1,049	602
Other Comprehensive Loss
Change in unrealized value of available-for-sale securities, net of income tax	63	(157)	132	(209)
Reclassification of gains included in net income, net of income tax	(394)	(126)	(899)	(465)
Other comprehensive loss	(331)	(283)	(767)	(674)
Net Comprehensive Income (Loss)	$ 165	$ (81)	$ 282	$ (72)
Basic
Net income per share	$ 0.15	$ 0.06	$ 0.31	$ 0.18
Weighted average shares	3,395,521	3,395,521	3,395,521	3,395,512
Diluted
Net income per share	$ 0.14	$ 0.05	$ 0.29	$ 0.16
Weighted average shares	3,653,021	3,658,957	3,653,021	3,650,572