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Note 3 - Revenues (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Contract with Customer, Liability, Revenue Recognized $ 0.4 $ 1.0 $ 3.0 $ 2.3