XML 73 R63.htm IDEA: XBRL DOCUMENT v3.19.1
Note 10 - Cash, Cash Equivalents, Investments and Restricted Cash - Cash Equivalents, Short-term and Long-term Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Cash $ 125,687 $ 131,569
Money market funds 56,082 41,135
U.S. treasuries and government agency bonds 32,202 32,068
Certificates of deposit 1,600 1,600
Total 362,314 380,522
Cash and cash equivalents 181,769 172,704
Short-term investments 177,255 204,577
Long-term investments 3,290 3,241
Corporate Debt Securities [Member]    
Available-for-sale securities 143,453 170,909
Auction Rate Securities [Member]    
Available-for-sale securities $ 3,290 $ 3,241