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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
Jun. 30, 2018
Dec. 31, 2017
Cash $ 66,994 $ 75,125
Money market funds 16,081 7,134
U.S. treasuries and government agency bonds 22,967 13,024
Total 318,750 304,346
Cash and cash equivalents 83,075 82,759
Short-term investments 230,428 216,331
Long-term investments 5,247 5,256
Corporate Debt Securities [Member]    
Available-for-sale securities 207,461 203,807
Auction Rate Securities [Member]    
Available-for-sale securities $ 5,247 $ 5,256