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Segment Information (Continuing Operating Segments) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) segment | Dec. 31, 2015 USD ($) segment
Net revenues | $ 7,087 | $ 7,636
Interest income | 20 | 0
Depreciation and amortization | 313 | 348
Interest expense | 1 | 11
Purchase of property and equipment | 8 | 70
Total assets | 13,058 | 13,421
Income before income taxes | $ 204 | $ 1,744
Number of reportable segments | segment | 1 | 2
Foreign Country Revenue [Member] |  |
Net revenues |  | $ 972
Production Monitoring [Member] |  |
Net revenues |  | 7,636
Interest income |  | 0
Depreciation and amortization |  | 348
Interest expense |  | 11
Purchase of property and equipment |  | 70
Total assets |  | 4,998
Income before income taxes |  | 295
Production Monitoring [Member] | Foreign Country Revenue [Member] |  |
Net revenues |  | 972
ESI Investment Company [Member] |  |
Interest income |  | 0
Total assets |  | 8,423
Income before income taxes |  | $ 1,449

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