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Note 6 - Property and Equipment (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Depreciation $ 11 $ 13 $ 23 $ 26  
Disposal Group, Including Discontinued Operation, Depreciation and Amortization 0 $ 0 0 $ 0  
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment $ 0   $ 0   $ 0