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Note 5 - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
Mar. 16, 2020
Mar. 31, 2020
Dec. 31, 2019
Long-term Line of Credit, Total   $ 1,932,560 $ 1,305,634
Line of Credit [Member]      
Line of Credit Facility, Remaining Borrowing Capacity   3,000  
Line of Credit [Member] | Swing Loan [Member]      
Long-term Line of Credit, Total   64,900 41,300
Revolving Credit Facility [Member]      
Line of Credit Facility, Maximum Borrowing Capacity   945,500  
Revolving Credit Facility [Member] | Line of Credit [Member]      
Long-term Line of Credit, Total   865,000 $ 235,000
Proceeds from Long-term Lines of Credit $ 670,000    
Letter of Credit [Member] | Line of Credit [Member]      
Long-term Line of Credit, Total   $ 12,600