Significant Customers (Schedule Of Sales By Geographic Area) (Details) (Sales [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenue, Major Customer [Line Items]
Total export sales	$ 7,450	$ 11,318	$ 12,827	$ 21,145
Americas [Member]
Revenue, Major Customer [Line Items]
Total export sales	442	608	498	1,105
Europe [Member]
Revenue, Major Customer [Line Items]
Total export sales	2,960	3,540	4,675	6,926
Asia [Member]
Revenue, Major Customer [Line Items]
Total export sales	3,900	6,939	7,392	12,739
Other [Member]
Revenue, Major Customer [Line Items]
Total export sales	$ 148	$ 231	$ 262	$ 375