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Note 1 - Summary of Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Cash and cash equivalents $ 402,975 $ 344,557 $ 730,908 $ 519,182
Restricted cash 16,249 12,571 17,368 15,817
Total cash, cash equivalents and restricted cash $ 419,224 $ 357,128 $ 748,276 $ 534,999