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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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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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