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Note 6 - Revenue (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Contract with Customer, Liability, Revenue Recognized $ 25.3 $ 49.8 $ 15.5
Other Current Liabilities [Member]      
Contract with Customer, Liability, Current $ 3.8