Significant Customers (Schedule Of Sales By Geographic Area) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenue, Major Customer [Line Items]
Export sales	$ 5,377	$ 9,827
Americas [Member]
Revenue, Major Customer [Line Items]
Export sales	56	497
Europe [Member]
Revenue, Major Customer [Line Items]
Export sales	1,716	3,386
Asia [Member]
Revenue, Major Customer [Line Items]
Export sales	3,491	5,800
Other [Member]
Revenue, Major Customer [Line Items]
Export sales	$ 114	$ 144