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Segment Information (Continuing Operating Segments) (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 segment | Dec. 31, 2011
Net revenues | $ 6,498,000 | $ 6,115,000
Sales in foreign countries | 809,000 | 633,000
Interest income | 4,000 | 6,000
Depreciation expense | 71,000 | 57,000
Capital purchases | 196,000 | 82,000
Total assets | 13,338,000 | 11,928,000
Income before income taxes | 1,642,000 | 809,000
Number of Reportable Segments | 2 |
Production Monitoring [Member] |  |
Net revenues | 6,498,000 | 6,115,000
Sales in foreign countries | 809,000 | 633,000
Interest income | 1,000 | 2,000
Depreciation expense | 71,000 | 57,000
Capital purchases | 196,000 | 82,000
Total assets | 3,016,000 | 2,488,000
Income before income taxes | 845,000 | 736,000
ESI Investment Company [Member] |  |
Net revenues | 0 | 0
Sales in foreign countries | 0 | 0
Interest income | 3,000 | 4,000
Depreciation expense | 0 | 0
Capital purchases | 0 | 0
Total assets | 10,322,000 | 9,440,000
Income before income taxes | $ 797,000 | $ 73,000

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