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Note 5 - Certain Balance Sheet Accounts (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Depreciation $ 0.2 $ 0.2 $ 0.5 $ 0.4