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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, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Cash and cash equivalents $ 570,926 $ 519,182 $ 506,046 $ 249,977
Restricted cash 17,392 15,817 15,024 20,471
Total cash, cash equivalents and restricted cash $ 588,318 $ 534,999 $ 521,070 $ 270,448