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Note 9 - Cash, Cash Equivalents, Investments and Restricted Cash - Cash Equivalents, Short-term and Long-term Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Cash $ 105,859 $ 75,125
Money market funds 25,235 7,134
U.S. treasuries and government agency bonds 24,230 13,024
Certificates of deposit 1,600
Total 353,105 304,346
Cash and cash equivalents 131,094 82,759
Short-term investments 216,754 216,331
Long-term investments 5,257 5,256
Corporate Debt Securities [Member]    
Available-for-sale securities 190,924 203,807
Auction Rate Securities [Member]    
Available-for-sale securities $ 5,257 $ 5,256