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Note 12 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 647 | $ 588
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 14 | $ 87
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards | $ 692 |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2029 |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member] |  |
Open Tax Year | 2014 |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member] |  |
Open Tax Year | 2017 |
Foreign Tax Authority [Member] | Tax Authority, Spain [Member] |  |
Operating Loss Carryforwards | $ 5,805 |
Foreign Tax Authority [Member] | Inland Revenue, Hong Kong [Member] | Earliest Tax Year [Member] |  |
Income Tax Examination, Year under Examination | 2009 |
Foreign Tax Authority [Member] | Inland Revenue, Hong Kong [Member] | Latest Tax Year [Member] |  |
Income Tax Examination, Year under Examination | 2011 |

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