Geographic Information (Geographical Distribution Of Net Sales) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 16,012	$ 17,341	$ 51,246	$ 51,063
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	11,645	13,165	36,138	37,565
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	2,706	1,495	8,523	4,903
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	1,380	2,498	5,918	7,727
All Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 281	$ 183	$ 667	$ 868