Tax year being audited in the income tax examination, in CCYY format.

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Tax year that remains open to examination under enacted tax laws, in CCYY format.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6527854

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Amount of expense 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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws, that is associated with a windfall tax benefit that will be recorded as additional paid in capital when realized.

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The tax rate for the amount of cash dividends distributed out of tax exempt profits in a manner other than upon complete liquidation.

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Note 9 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Domestic Tax Authority [Member] \| Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	$ 439
Domestic Tax Authority [Member] \| Earliest Tax Year [Member]
Open Tax Year	2010
Domestic Tax Authority [Member]
Operating Loss Carryforwards	$ 42,629
Operating Loss Carryforwards, Windfall Tax Benefit	20,520
State and Local Jurisdiction [Member] \| Retention [Member]
Tax Credit Carryforward, Amount	$ 24
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]
Operating Loss Carryforwards	$ 30,052
Operating Loss Carryforwards, Windfall Tax Benefit	14,535
Foreign Tax Authority [Member] \| Foreign Tax Credit [Member]
Tax Credit Carryforward, Amount	$ 158
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]
Operating Loss Carryforwards	$ 1,563
Israel Tax Authority [Member] \| VSL [Member] \| Latest Tax Year [Member]
Open Tax Year	2012
Israel Tax Authority [Member]
Tax Credit Carryforward, Amount	$ 224
Her Majesty's Revenue and Customs (HMRC) [Member] \| VSUK [Member] \| Latest Tax Year [Member]
Open Tax Year	2012
Ministry of the Economy, Finance and Industry, France [Member] \| VSF [Member] \| Latest Tax Year [Member]
Open Tax Year	2012
Unrecognized Tax Benefits	$ 897	$ 577	$ 269
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	800
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	32
Undistributed Earnings of Foreign Subsidiaries	$ 2,490