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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, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Cash and cash equivalents $ 831,246 $ 249,977 $ 247,681 $ 249,417
Restricted cash 18,529 20,471 24,951 23,785
Total cash, cash equivalents and restricted cash $ 849,775 $ 270,448 $ 272,632 $ 273,202