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Note 14 - Taxes on Income (Details Textual)
$ in Thousands, ₪ in Billions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
ILS (₪)
Dec. 31, 2017
USD ($)
Tax Cuts and Jobs Act of 2017, Transition Tax, Income Tax Expense (Benefit)       $ 16,053
Unrecognized Tax Benefits, Ending Balance $ 1,037 $ 2,739   $ 2,224
Unrecognized Tax Benefits, Income Tax Penalties Accrued 0 0    
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions 16 60    
Unrecognized Tax Benefits, Decreases Resulting from Tax Audit Completion 2,164    
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 $ 1,029      
Foreign Tax Authority [Member] | Revenue Commissioners, Ireland [Member]        
Effective Income Tax Rate Reconciliation, Percent, Total 12.50%      
Open Tax Year 2014 2015 2016 2017 2018 2019      
Operating Loss Carryforwards, Total $ 59,304      
Foreign Tax Authority [Member] | Revenue Commissioners, Ireland [Member] | Interest Income [Member]        
Effective Income Tax Rate Reconciliation, Percent, Total 25.00%      
Foreign Tax Authority [Member] | Israel Tax Authority [Member]        
Income Tax Rate, Foreign Ownership Exceeds 90% 10.00%      
Income Tax Rate, Foreign Ownership Exceeds 49% 20.00%      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 23.00% 23.00% 23.00% 24.00%
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      
Foreign Tax Authority [Member] | Israel Tax Authority [Member] | Maximum [Member]        
Effective Income Tax Rate Reconciliation, Percent, Total 23.00%      
Tax Exemption Period 10 years      
Foreign Tax Authority [Member] | Ministry of the Economy, Finance and Industry, France [Member]        
Open Tax Year   2017 2018 2019 2017 2018 2019  
Effective Income Tax Rate Reconciliation, Taxable Profit Up to 500,000 Euros, Percent 28.00% 28.00% 28.00%  
Effective Income Tax Rate Reconciliation, Taxable Profit Above 500,000 Euros, Percent 31.00% 33.33% 33.33%  
Operating Loss Carryforwards, Total $ 2,602      
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%      
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%      
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%      
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]        
Operating Loss Carryforwards, Total $ 9,101      
Net Operating Loss Carryforwards Begins to Expire 2030