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Note 4 - Unaudited Summarized Financial Information for NKD Enterprises, LLC - Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Revenues | $ 2,188 | $ 2,050
Operating loss | (152) | (168)
Net loss | (152) | (168)
NKD Enterprises LLC [Member] |  |
Current assets | 115 | 107
Non-current assets | 3,005 | 3,002
Current liabilities | 563 | 400
Stockholders’ equity | $ 2,557 | $ 2,709

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