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Note 3 - Financial Assets Measured on a Recurring Basis (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]  
Assets, fair value $ 67,089
Money Market Funds [Member]  
Assets, fair value 67,089
Domestic Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]  
Assets, fair value 28,715
Domestic Corporate Debt Securities [Member]  
Assets, fair value 28,715
Foreign Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]  
Assets, fair value 4,922
Foreign Corporate Debt Securities [Member]  
Assets, fair value 4,922
United States Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member]  
Assets, fair value 7,770
United States Commercial Paper [Member]  
Assets, fair value 7,770
Foreign Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member]  
Assets, fair value 15,579
Foreign Commercial Paper [Member]  
Assets, fair value 15,579
Fair Value, Inputs, Level 1 [Member]  
Assets, fair value 67,089
Fair Value, Inputs, Level 2 [Member]  
Assets, fair value 56,986
Assets, fair value $ 124,075