Segment Information (Continuing Operating Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 segment	Sep. 30, 2012
Net revenues	$ 1,708	$ 1,567	$ 4,813	$ 5,004
Net Income before taxes	150	221	754	629
Number of reportable segments			2
Production Monitoring [Member]
Net revenues	1,708	1,567	4,813	5,004
Net Income before taxes	18	220	220	626
Investments [Member]
Net Income before taxes	$ 132	$ 1	$ 534	$ 3