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Note 1 - Summary of Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Cash and cash equivalents $ 235,084 $ 249,417 $ 440,963 $ 203,104
Restricted cash 26,355 23,785 33,596 24,175
Total cash, cash equivalents and restricted cash $ 261,439 $ 273,202 $ 474,559 $ 227,279