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Segment Information (Continuing Operating Segments) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
segment
Jun. 30, 2013
Dec. 31, 2013
Net revenues $ 1,760 $ 1,571 $ 3,462 $ 3,105  
Interest income 1 0 2 2  
Purchase of property and equipment     16 12  
Total assets 13,647   13,647   12,609
Income before Income Taxes 311 415 926 604  
Number of reportable segments     2    
Production Monitoring [Member]
         
Net revenues 1,760 1,571 3,462 3,105  
Income before Income Taxes 107 117 174 201  
Investments [Member]
         
Income before Income Taxes $ 204 $ 298 $ 752 $ 403