Revenue Concentrations, Significant Customers And Geographic Areas (Tables)

9 Months Ended

Sep. 30, 2017

Segment Reporting [Abstract]

Schedule of Sales By Geographic Area

Export sales by geographic area are summarized as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
(In thousands)	2017		2016		2017		2016
Americas	$	159	$	344	$	976	$	1,114
Europe		2,543		3,592	9,114		13,463
Asia		4,959		8,675	18,933		29,322
Other		103		10	247		44
Total export sales	$	7,764	$	12,621	$	29,270	$	43,943