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Note 6 - Long-term Debt (Details Textual) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Long-Term Line of Credit $ 1,194.6 $ 1,046.3
Line of Credit Facility, Remaining Borrowing Capacity 1,012.4  
Bank Credit Facility [Member] | Revolving Credit Facility [Member]    
Line of Credit Facility, Maximum Borrowing Capacity 1,450.0  
Long-Term Line of Credit 380.0  
Bank Credit Facility [Member] | Swing Loan [Member]    
Long-Term Line of Credit 44.6  
Bank Credit Facility [Member] | Letter of Credit [Member]    
Long-Term Line of Credit $ 13.0