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Note 1 - Summary of Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash and cash equivalents $ 519,182 $ 249,977 $ 249,417 $ 203,104
Restricted cash 15,817 20,471 23,785 24,175
Total cash, cash equivalents and restricted cash $ 534,999 $ 270,448 $ 273,202 $ 227,279