Segment Information (Continuing Operating Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 segment	Jun. 30, 2012
Net revenues	$ 1,571	$ 1,795	$ 3,105	$ 3,437
Net Income before taxes	415	282	604	408
Number of reportable segments			2
Production Monitoring [Member]
Net revenues	1,571	1,795	3,105	3,437
Net Income before taxes	117	281	201	406
Investments [Member]
Net Income before taxes	$ 298	$ 1	$ 403	$ 2