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Note 3 - Cash, Cash Equivalents and Investments - Cash Equivalents, Short-term and Long-term Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash $ 75,125 $ 87,747    
Money market funds 7,134 24,956    
U.S. treasuries and government agency bonds 13,024 45,877    
Total 304,346 273,578    
Cash and cash equivalents 82,759 112,703 $ 90,860 $ 126,266
Short-term investments 216,331 155,521    
Long-term investments 5,256 5,354    
Corporate Debt Securities [Member]        
Available-for-sale securities 203,807 109,644    
Auction Rate Securities [Member]        
Available-for-sale securities $ 5,256 $ 5,354