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Note 2 - Summary of Significant Accounting Policies - Components of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash and cash equivalents $ 7,504 $ 11,952    
Restricted cash included in other assets 475 475    
Total cash, cash equivalents, and restricted cash in the consolidated statements of cash flows $ 7,979 $ 12,427 $ 7,412 $ 3,658