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Note 12 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets, Gross, Noncurrent	$ 11,460	$ 8,767
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	679	647
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	15	$ 14
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards, Total	8,400
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	8,400
Foreign Tax Authority [Member] | Tax Authority, Spain [Member]
Operating Loss Carryforwards, Total	$ 7,500
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

X

- Definition

Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences and carryforwards, classified as noncurrent.

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