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Segment Information (Continuing Operating Segments) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
segment
Dec. 31, 2012
Net revenues $ 6,541 $ 6,498
Interest income 5 4
Depreciation 110 71
Purchase of property and equipment 23 196
Total assets 12,609 13,338
Income before Income Taxes 938 1,642
Number of reportable segments 2  
Foreign Country Revenue [Member]
    
Net revenues 932 809
Production Monitoring [Member]
    
Net revenues 6,541 6,498
Interest income 1 1
Depreciation 110 71
Purchase of property and equipment 23 196
Total assets 3,022 3,016
Income before Income Taxes 404 845
Production Monitoring [Member] | Foreign Country Revenue [Member]
    
Net revenues 932 809
ESI Investment Company [Member]
    
Interest income 4 3
Total assets 9,587 10,322
Income before Income Taxes $ 534 $ 797