Significant Customers (Schedule Of Sales By Geographic Area) (Details) (Sales [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue, Major Customer [Line Items]
Total export sales	$ 6,392	$ 9,707	$ 19,219	$ 30,850
Americas [Member]
Revenue, Major Customer [Line Items]
Total export sales	85	172	582	1,276
Europe [Member]
Revenue, Major Customer [Line Items]
Total export sales	1,820	3,513	6,495	10,438
Asia [Member]
Revenue, Major Customer [Line Items]
Total export sales	4,412	5,943	11,804	18,681
Other [Member]
Revenue, Major Customer [Line Items]
Total export sales	$ 75	$ 79	$ 338	$ 455