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Note 3 - Financing Arrangements (Details Textual) - USD ($)
$ in Thousands
1 Months Ended
Mar. 31, 2019
Dec. 31, 2019
Long-term Debt, Maturities, Repayments of Principal in Year Three   $ 353,100
Long-term Debt, Maturities, Repayments of Principal in Year Five   248,600
Long-term Debt, Maturities, Repayments of Principal after Year Five   694,000
Senior Notes [Member] | Senior Notes, First Issuance [Member]    
Unsecured Debt, Total   $ 250,000
Debt Instrument, Interest Rate, Stated Percentage   3.85%
Senior Notes [Member] | Senior Notes, Second Issuance [Member]    
Unsecured Debt, Total   $ 350,000
Debt Instrument, Interest Rate, Stated Percentage   3.30%
Senior Notes [Member] | Senior Notes, Third Issuance [Member]    
Unsecured Debt, Total   $ 700,000
Debt Instrument, Interest Rate, Stated Percentage   3.875%
Senior Notes [Member] | The 2.40% Senior Notes [Member]    
Debt Instrument, Interest Rate, Stated Percentage 2.40%  
Repayments of Unsecured Debt $ 250,000  
Revolving Credit Facility [Member]    
Line of Credit Facility, Maximum Borrowing Capacity   $ 750,000
Line of Credit Facility, Maximum Borrowing Capacity, Optional Increase   250,000
Long-term Line of Credit, Total   $ 0