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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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