Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Fair Value Measurements and Financial Instruments - Assets Measured on a Recurring Basis (Details)

v3.19.1
Note 6 - Fair Value Measurements and Financial Instruments - Assets Measured on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Assets, fair value $ 15,797 $ 15,118
Fair Value, Inputs, Level 2 [Member]    
Assets, fair value 15,797 15,118
Bank Time Deposits [Member]    
Assets, fair value 1,164 496
Bank Time Deposits [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, fair value 1,164 496
US Treasury Securities [Member]    
Assets, fair value 4,486 3,989
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, fair value 4,486 3,989
Debt Security, Government, Non-US [Member]    
Assets, fair value 4,986 5,991
Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, fair value 4,986 5,991
Investments [Member]    
Assets, fair value 5,161 4,642
Investments [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, fair value $ 5,161 $ 4,642