Note 2 - Summary of Significant Accounting Policies - Components of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Cash and cash equivalents	$ 3,746	$ 5,362
Restricted cash included in other assets	476	484
Total cash, cash equivalents, and restricted cash in the condensed consolidated statements of cash flows	$ 4,222	$ 5,846	$ 5,793	$ 7,979