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Note 6 - Property and Equipment (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Depreciation, Depletion and Amortization $ 13 $ 29 $ 39 $ 88