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Note 6 - Fair Value Measurement - Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Marketable securities $ 76,123 $ 77,469
Foreign exchange contracts 54
Investment in other company [1]   936
Foreign exchange contracts 77
Fair Value, Inputs, Level 1 [Member]    
Foreign exchange contracts  
Investment in other company [1]  
Foreign exchange contracts  
Fair Value, Inputs, Level 2 [Member]    
Foreign exchange contracts 54  
Investment in other company [1]  
Foreign exchange contracts   77
Fair Value, Inputs, Level 3 [Member]    
Foreign exchange contracts  
Investment in other company [1]   936
Foreign exchange contracts  
Certificates of Deposits [Member]    
Marketable securities 747 747
Certificates of Deposits [Member] | Fair Value, Inputs, Level 1 [Member]    
Marketable securities
Certificates of Deposits [Member] | Fair Value, Inputs, Level 2 [Member]    
Marketable securities 747 747
Certificates of Deposits [Member] | Fair Value, Inputs, Level 3 [Member]    
Marketable securities
Government Bonds [Member]    
Marketable securities 500 496
Government Bonds [Member] | Fair Value, Inputs, Level 1 [Member]    
Marketable securities
Government Bonds [Member] | Fair Value, Inputs, Level 2 [Member]    
Marketable securities 500 496
Government Bonds [Member] | Fair Value, Inputs, Level 3 [Member]    
Marketable securities
Corporate Bonds [Member]    
Marketable securities 74,876 76,226
Corporate Bonds [Member] | Fair Value, Inputs, Level 1 [Member]    
Marketable securities
Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]    
Marketable securities 74,876 76,226
Corporate Bonds [Member] | Fair Value, Inputs, Level 3 [Member]    
Marketable securities
[1] Non- marketable equity securities remeasured during the year ended December 31, 2018.