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Note 10 - Commitments and Contingencies (Details Textual) - Forecast [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Minimum [Member]    
Expected Capital Expenditures To Be Incurred, Net $ 80 $ 130
Maximum [Member]    
Expected Capital Expenditures To Be Incurred, Net $ 90 $ 140