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Note 6 - Property and Equipment (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Depreciation $ 9 $ 13 $ 32 $ 39  
Disposal Group, Including Discontinued Operation, Depreciation and Amortization 0 $ 0 0 $ 0  
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment $ 0   $ 0   $ 0