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Note 5 - Fair Value Measurements and Financial Instruments - Assets Measured on a Recurring Basis (Details)

v3.19.1
Note 5 - Fair Value Measurements and Financial Instruments - Assets Measured on a Recurring Basis (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Assets, fair value $ 17,411 $ 8,204
Fair Value, Inputs, Level 1 [Member]    
Assets, fair value
Fair Value, Inputs, Level 2 [Member]    
Assets, fair value 17,411 8,204
Fair Value, Inputs, Level 3 [Member]    
Assets, fair value
Bank Time Deposits [Member]    
Assets, fair value 1,395  
Bank Time Deposits [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, fair value  
Bank Time Deposits [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, fair value 1,395  
Bank Time Deposits [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, fair value  
Debt Security, Government, Non-US [Member]    
Assets, fair value 5,481 2,003
Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, fair value
Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, fair value 5,481 2,003
Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, fair value
US Treasury Securities [Member]    
Assets, fair value 5,989  
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, fair value  
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, fair value 5,989  
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, fair value  
Corporate Debt Securities [Member]    
Assets, fair value   1,999
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, fair value  
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, fair value   1,999
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, fair value  
Investments [Member]    
Assets, fair value 4,546 4,202
Investments [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, fair value
Investments [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, fair value 4,546 4,202
Investments [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, fair value