Significant Customers (Schedule Of Sales By Geographic Area) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenue, Major Customer [Line Items]
Export sales	$ 9,707	$ 14,991	$ 30,850	$ 41,161
Americas [Member]
Revenue, Major Customer [Line Items]
Export sales	172	399	1,276	1,265
Europe [Member]
Revenue, Major Customer [Line Items]
Export sales	3,513	3,146	10,438	11,749
Asia [Member]
Revenue, Major Customer [Line Items]
Export sales	5,943	11,160	18,681	27,272
Other [Member]
Revenue, Major Customer [Line Items]
Export sales	$ 79	$ 286	$ 455	$ 875