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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, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Corporate Debt Securities [Member]        
Available-for-sale securities $ 20,665    
Auction Rate Securities [Member]        
Available-for-sale securities 5,382 5,361    
Cash 62,218 58,217    
Money market funds 47,261 31,640    
Certificates of deposit 7,495 21,574    
U.S. treasuries and government agency bonds 121,424 123,532    
Total 264,445 240,324    
Cash and cash equivalents 109,479 90,860 $ 76,616 $ 126,266
Short-term investments 149,584 144,103    
Long-term investments $ 5,382 $ 5,361