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Note 9 - Cash, Cash Equivalents and Investments (Details) - Cash Equivalents, Short-term and Long-term Investments - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Cash, cash equivalents and investments:        
Cash $ 46,179 $ 66,188    
Money market funds 34,689 60,078    
Certificates of deposit 23,093 22,778    
U.S. treasuries and government agency bonds 127,073 89,674    
Total 236,409 244,107    
Cash and cash equivalents 80,868 126,266 $ 107,863 $ 101,213
Short-term investments 150,166 112,452    
Long-term investments 5,375 5,389    
Auction Rate Securities [Member]        
Cash, cash equivalents and investments:        
Auction-rate securities backed by student-loan notes $ 5,375 $ 5,389