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Note 8 - Cash, Cash Equivalents and Investments - Cash Equivalents, Short-term and Long-term Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Cash $ 91,674 $ 87,747    
Money market funds 11,250 24,956    
U.S. treasuries and government agency bonds 16,123 45,877    
Total 304,966 273,578    
Cash and cash equivalents 104,424 112,703 $ 109,479 $ 90,860
Short-term investments 195,174 155,521    
Long-term investments 5,368 5,354    
Corporate Debt Securities [Member]        
Available-for-sale securities 180,551 109,644    
Auction Rate Securities [Member]        
Available-for-sale securities $ 5,368 $ 5,354