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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