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Foreign Revenues (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Significant Foreign Revenues: |  |
Revenues from operations | $ 20,891 | $ 20,713
Malaysia [Member] |  |
Significant Foreign Revenues: |  |
Revenues from operations | 3,240 | 2,455
China [Member] |  |
Significant Foreign Revenues: |  |
Revenues from operations | 315 | 778
All other foreign countries [Member] |  |
Significant Foreign Revenues: |  |
Revenues from operations | 2,443 | 2,220
Foreign [Member] |  |
Significant Foreign Revenues: |  |
Revenues from operations | $ 5,998 | 5,453
Portion of foreign sales | 10.00% |
Domestic [Member] |  |
Significant Foreign Revenues: |  |
Revenues from operations | $ 14,893 | $ 15,260

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