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Note 5 - Long-term Debt (Details Textual) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Long-Term Line of Credit $ 997.0 $ 1,046.3
Bank Credit Facility [Member] | Revolving Credit Facility [Member]    
Line of Credit Facility, Maximum Borrowing Capacity 1,450.0  
Long-Term Line of Credit 145.0  
Bank Credit Facility [Member] | Swing Loan [Member]    
Long-Term Line of Credit 60.0  
Bank Credit Facility [Member] | Letter of Credit [Member]    
Long-Term Line of Credit 13.4  
Bank Credit Facility [Member] | Line of Credit [Member]    
Line of Credit Facility, Remaining Borrowing Capacity $ 1,231.6