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Segment Information (Continuing Operating Segments) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Net sales $ 1,795 $ 1,543 $ 3,437 $ 3,060
Net Income before taxes 282 195 408 392
Production Monitoring [Member]
       
Net sales 1,795 1,543 3,437 3,060
Net Income before taxes 281 193 406 388
Investments [Member]
       
Net sales 0 0 0 0
Net Income before taxes $ 1 $ 2 $ 2 $ 4