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Note 15 - Foreign Revenues and Operations (Details Textual) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets | $ 21,779,000 | $ 22,704,000
INDIA |  |
Assets, Noncurrent | 176,000 | 183,000
Foreign [Member] |  |
Assets | 589,000 | 648,000
Liabilities | $ 675,000 | $ 526,000

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