Geographic And Customer Information (Geographical Distribution Of Net Sales) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 88,310	$ 68,009	$ 68,527
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	70,746	47,460	49,687
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	9,249	11,019	6,634
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	7,477	8,187	10,901
All Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 838	$ 1,343	$ 1,305