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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, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Cash and cash equivalents $ 506,046 $ 249,977 $ 235,084 $ 249,417
Restricted cash 15,024 20,471 26,355 23,785
Total cash, cash equivalents and restricted cash $ 521,070 $ 270,448 $ 261,439 $ 273,202