Statements Of Cash Flows (Supplemental Disclosures Of Cash Flow Information) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statements Of Cash Flows [Abstract]
Interest received	$ 1	$ 1	$ 2
Interest paid	594	461	531
Income taxes paid	5	4	7
Shares issued for director services in lieu of fees	6	10	10
Retirement of treasury shares		1,265
Receivables on the sale of Global Coils	$ 721