Geographic Information (Geographical Distribution Of Net Sales) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 25,363	$ 21,215
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	20,459	16,650
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	2,278	2,478
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	2,468	1,910
All Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 158	$ 177