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Note 7 - Property and Equipment, Net (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Depreciation, Total $ 0.2 $ 58.6 $ 0.4 $ 0.5