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Note 2 - Cash, Cash Equivalents and Restricted Cash - Summary 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 $ 202,997 $ 209,575    
Restricted cash 1,742 1,672    
Total cash, cash equivalents and restricted cash shown in the statements of cash flows $ 204,739 $ 211,247 $ 207,424 $ 196,740