Segment Information (Continuing Operating Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 segment	Mar. 31, 2012
Net revenues	$ 1,534	$ 1,642
Net Income before taxes	189	126
Number of reportable segments	2
Production Monitoring [Member]
Net revenues	1,534	1,642
Net Income before taxes	84	125
Investments [Member]
Net revenues	0	0
Net Income before taxes	$ 105	$ 1