Geographic Information (Geographical Distribution Of Net Sales) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, net	$ 26,893	$ 29,566	$ 85,800	$ 83,590
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, net	22,483	25,157	71,059	70,871
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, net	1,248	1,500	4,480	4,163
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, net	2,780	2,472	9,508	7,639
All Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, net	$ 382	$ 437	$ 753	$ 917