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Note 14 - Taxes on Income (Details Textual)
$ in Thousands, ₪ in Billions
1 Months Ended 12 Months Ended
Jan. 01, 2018
Dec. 31, 2016
USD ($)
Dec. 31, 2018
Dec. 31, 2017
USD ($)
Dec. 31, 2017
ILS (₪)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent       35.00% 35.00% 35.00% 35.00%
Deferred Tax Assets, Valuation Allowance   $ 7,708   $ 5,998   $ 7,708  
Cash and Cash Equivalents, Marketable Securities and Time Deposit       129,200      
Unrecognized Tax Benefits   1,023   1,273   1,023 $ 1,711
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued   $ 46   68   $ 46  
Domestic Tax Authority [Member]              
Operating Loss Carryforwards       17,719      
State and Local Jurisdiction [Member]              
Operating Loss Carryforwards       $ 2,650      
Israel Tax Authority [Member]              
Corporate Tax Rate       24.00% 24.00% 25.00% 26.50%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount       $ 41,069      
Income Tax, Net, Liabilities       4,563      
Operating Loss Carryforwards       $ 12,196      
Israel Tax Authority [Member] | DSP Israel [Member]              
Corporate Tax Rate       16.00% 16.00%    
Israel Tax Authority [Member] | Minimum [Member]              
Tax Credit Carryforward, Expiration Period       13 years 13 years    
Israel Tax Authority [Member] | Maximum [Member]              
Tax Credit Carryforward, Expiration Period       20 years 20 years    
Israel Tax Authority [Member] | Approved Enterprise Investment [Member]              
Tax Exemption Period       2 years 2 years    
Corporate Tax Rate       10.00% 10.00%    
Additional Tax Exemption Period       6 years 6 years    
Israel Tax Authority [Member] | Beneficiary Enterprise [Member]              
Tax Exemption Period       4 years 4 years    
Corporate Tax Rate       25.00% 25.00%    
Additional Tax Exemption Period       8 years 8 years    
Israel Tax Authority [Member] | First, Second, Third, Fourth, Fifth and Sixth Investment Programs [Member] | Minimum [Member]              
Tax Exemption Period       2 years 2 years    
Corporate Tax Rate       10.00% 10.00%    
Additional Tax Exemption Period       6 years 6 years    
Israel Tax Authority [Member] | First, Second, Third, Fourth, Fifth and Sixth Investment Programs [Member] | Maximum [Member]              
Tax Exemption Period       4 years 4 years    
Corporate Tax Rate       25.00% 25.00%    
Additional Tax Exemption Period       8 years 8 years    
Israel Tax Authority [Member] | Seventh and Eighth Investment Programs [Member]              
Tax Exemption Period       2 years 2 years    
Additional Tax Exemption Period       8 years 8 years    
Israel Tax Authority [Member] | Seventh and Eighth Investment Programs [Member] | Minimum [Member]              
Corporate Tax Rate       10.00% 10.00%    
Israel Tax Authority [Member] | Seventh and Eighth Investment Programs [Member] | Maximum [Member]              
Corporate Tax Rate       25.00% 25.00%    
Israel Tax Authority [Member] | Preferred Enterprises [Member]              
Corporate Tax Rate   9.00%   7.50% 7.50%    
Israel Tax Authority [Member] | Technological Preferred Enterprise [Member]              
Corporate Tax Rate       12.00% 12.00%    
Technological Preferred Enterprise, Maximum, Consolidated Revenues       $ 2,600,000 ₪ 10    
Tax Rate, Dividends from Technological Enterprises to Foreign Companies       4.00% 4.00%    
Investment Held by Foreign Entities [Member]              
Cash and Cash Equivalents, Marketable Securities and Time Deposit       $ 118,100      
Scenario, Forecast [Member]              
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     21.00%        
Scenario, Forecast [Member] | Israel Tax Authority [Member]              
Corporate Tax Rate 23.00%