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Note 9 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Unrecognized Tax Benefits | $ 2,106 | $ 897 | $ 577
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 1,593 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 33 |  |
Undistributed Earnings of Foreign Subsidiaries | 2,492 |  |
Israel Tax Authority [Member] |  |  |
Tax Credit Carryforward, Amount | $ 264 |  |
Israel Tax Authority [Member] | VSL [Member] | Earliest Tax Year [Member] |  |  |
Income Tax Examination, Year under Examination | 2013 |  |
Israel Tax Authority [Member] | VSL [Member] | Latest Tax Year [Member] |  |  |
Income Tax Examination, Year under Examination | 2015 |  |
Open Tax Year | 2012 |  |
Her Majesty's Revenue and Customs (HMRC) [Member] | VSL [Member] | Latest Tax Year [Member] |  |  |
Open Tax Year | 2012 |  |
Ministry of the Economy, Finance and Industry, France [Member] | VSL [Member] | Latest Tax Year [Member] |  |  |
Open Tax Year | 2012 |  |
Domestic Tax Authority [Member] |  |  |
Operating Loss Carryforwards | $ 30,577 |  |
Operating Loss Carryforwards, Windfall Tax Benefit | $ 20,974 |  |
Domestic Tax Authority [Member] | Earliest Tax Year [Member] |  |  |
Open Tax Year | 2010 |  |
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member] |  |  |
Tax Credit Carryforward, Amount | $ 2,565 |  |
State and Local Jurisdiction [Member] |  |  |
Operating Loss Carryforwards | 35,792 |  |
Operating Loss Carryforwards, Windfall Tax Benefit | $ 15,602 |  |
State and Local Jurisdiction [Member] | Earliest Tax Year [Member] |  |  |
Income Tax Examination, Year under Examination | 2009 |  |
Open Tax Year | 2009 |  |
State and Local Jurisdiction [Member] | Latest Tax Year [Member] |  |  |
Income Tax Examination, Year under Examination | 2012 |  |
State and Local Jurisdiction [Member] | Retention [Member] |  |  |
Tax Credit Carryforward, Amount | $ 24 |  |
Foreign Tax Authority [Member] |  |  |
Operating Loss Carryforwards | $ 1,686 |  |
Foreign Tax Authority [Member] | Israel Tax Authority [Member] | VSL [Member] | Minimum [Member] |  |  |
Tax Rate for Amount of Dividends Distributed, Other Than Complete Liquidation | 10.00% |  |
Foreign Tax Authority [Member] | Israel Tax Authority [Member] | VSL [Member] | Maximum [Member] |  |  |
Tax Rate for Amount of Dividends Distributed, Other Than Complete Liquidation | 25.00% |  |
Foreign Tax Authority [Member] | Foreign Tax Credit [Member] |  |  |
Tax Credit Carryforward, Amount | $ 177 |  |

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