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Note 1 - Nature of Activities and Summary of Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Cash and cash equivalents $ 4,313 $ 7,751
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows 6,999 $ 7,751
Other Current Assets [Member]    
Restricted cash 725  
Other Assets [Member]    
Restricted cash $ 1,961