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Note 13 - Taxes on Income (Details Textual) $ in Thousands, ₪ in Billions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2018 ILS (₪)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Tax Cuts and Jobs Act of 2017, Transition Tax, Income Tax Expense (Benefit)			$ 16,053
Unrecognized Tax Benefits, Ending Balance	$ 2,739		2,224	$ 3,784
Unrecognized Tax Benefits, Income Tax Penalties Accrued	0		0
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	60
Unrecognized Tax Benefits, Decreases Resulting from Tax Audit Completion			3,003
Maximum [Member] | Technological Preferred Enterprise [Member]
Taxable Income Subject to Lower Tax Rate | ₪		₪ 10
Foreign Tax Authority [Member]
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions			1,805
Unrecognized Tax Benefits, Interest on Income Taxes Accrued			$ 130
Foreign Tax Authority [Member] | Revenue Commissioners, Ireland [Member]
Effective Income Tax Rate Reconciliation, Percent, Total	12.50%	12.50%
Open Tax Year	2013 2014 2015 2016 2017 2018	2013 2014 2015 2016 2017 2018
Operating Loss Carryforwards, Total	$ 60,252
Foreign Tax Authority [Member] | Revenue Commissioners, Ireland [Member] | Interest Income [Member]
Effective Income Tax Rate Reconciliation, Percent, Total	25.00%	25.00%
Foreign Tax Authority [Member] | Israel Tax Authority [Member]
Open Tax Year	2014 2015 2016 2017 2018	2014 2015 2016 2017 2018
Income Tax Rate, Foreign Ownership Exceeds 90%	10.00%	10.00%
Income Tax Rate, Foreign Ownership Exceeds 49%	20.00%	20.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	23.00%	23.00%	24.00%	25.00%
Foreign Tax Authority [Member] | Israel Tax Authority [Member] | Dividends Paid to Foreign Companies [Member]
Effective Income Tax Rate Reconciliation, Percent, Total	4.00%	4.00%
Foreign Tax Authority [Member] | Israel Tax Authority [Member] | Intellectual Property [Member]
Effective Income Tax Rate Reconciliation, Percent, Total	12.00%	12.00%
Foreign Tax Authority [Member] | Israel Tax Authority [Member] | Intellectual Property [Member] | Development Area A [Member]
Effective Income Tax Rate Reconciliation, Percent, Total	7.50%	7.50%
Foreign Tax Authority [Member] | Israel Tax Authority [Member] | Minimum [Member]
Tax Exemption Period	2 years	2 years
Foreign Tax Authority [Member] | Israel Tax Authority [Member] | Maximum [Member]
Effective Income Tax Rate Reconciliation, Percent, Total	23.00%	23.00%
Tax Exemption Period	10 years	10 years
Foreign Tax Authority [Member] | Ministry of the Economy, Finance and Industry, France [Member]
Open Tax Year	2017 2018	2017 2018
Effective Income Tax Rate Reconciliation, Taxable Profit Up to 500,000 Euros, Percent	28.00%	28.00%
Effective Income Tax Rate Reconciliation, Taxable Profit Above 500,000 Euros, Percent	33.33%	33.33%
Operating Loss Carryforwards, Total	$ 4,602
Foreign Tax Authority [Member] | Ministry of the Economy, Finance and Industry, France [Member] | Tax Year 2019 [Member]
Effective Income Tax Rate Reconciliation, Taxable Profit Up to 500,000 Euros, Percent	28.00%	28.00%
Effective Income Tax Rate Reconciliation, Taxable Profit Above 500,000 Euros, Percent	31.00%	31.00%
Foreign Tax Authority [Member] | Ministry of the Economy, Finance and Industry, France [Member] | Tax Year 2020 [Member]
Effective Income Tax Rate Reconciliation, Percent, Total	28.00%	28.00%
Foreign Tax Authority [Member] | Ministry of the Economy, Finance and Industry, France [Member] | Tax Year 2021 [Member]
Effective Income Tax Rate Reconciliation, Percent, Total	26.50%	26.50%
Foreign Tax Authority [Member] | Ministry of the Economy, Finance and Industry, France [Member] | Tax Year 2022 [Member]
Effective Income Tax Rate Reconciliation, Percent, Total	25.00%	25.00%
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]
Operating Loss Carryforwards, Total	$ 8,249
Net Operating Loss Carryforwards Begins to Expire	2030	2030

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