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Note 10 - Cash, Cash Equivalents, Investments and Restricted Cash - Cash Equivalents, Short-term and Long-term Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Cash $ 162,741 $ 131,569
Money market funds 39,982 41,135
U.S. treasuries and government agency bonds 20,350 32,068
Certificates of deposit   1,600
Total 422,004 380,522
Cash and cash equivalents 205,229 172,704
Short-term investments 213,511 204,577
Long-term investments 3,264 3,241
Corporate Debt Securities [Member]    
Available-for-sale securities 195,667 170,909
Auction Rate Securities [Member]    
Available-for-sale securities $ 3,264 $ 3,241