Statements Of Cash Flows (Supplemental Disclosures Of Cash Flow Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest received	$ 1	$ 1	$ 1
Interest paid	568	437	432
Income taxes paid	$ 196	$ 263	132
Shares issued for director services in lieu of fees			8
Common Stock [Member]
Shares issued for director services in lieu of fees			$ 1