Revenue Concentrations, Significant Customers And Geographic Areas (Schedule Of Sales By Geographic Area) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue, Major Customer [Line Items]
Total export sales	$ 15,066	$ 7,543	$ 31,322	$ 14,454
Americas
Revenue, Major Customer [Line Items]
Total export sales	29	201	770	269
Europe
Revenue, Major Customer [Line Items]
Total export sales	5,756	2,871	9,871	5,591
Asia
Revenue, Major Customer [Line Items]
Total export sales	9,262	4,327	20,647	8,353
Other
Revenue, Major Customer [Line Items]
Total export sales	$ 19	$ 144	$ 34	$ 241