Significant Customers, Geographic Areas, And Business Segments (Summary Of Revenue By Product Line) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Product Information [Line Items]
Revenues	$ 8,552	$ 8,726	$ 9,317	$ 6,713	$ 5,803	$ 11,558	$ 13,003	$ 11,280	$ 33,308	$ 41,644
OEM Alignment Sensors [Member]
Product Information [Line Items]
Revenues									10,792	13,187
Semiconductor Sensors [Member]
Product Information [Line Items]
Revenues									7,096	6,363
SMT Inspection Sensors [Member]
Product Information [Line Items]
Revenues									$ 15,420	$ 22,094