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Note 14 - Debt (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 15, 2022
Jun. 30, 2022
Sep. 30, 2022
Sep. 09, 2022
Feb. 03, 2022
Feb. 02, 2022
Dec. 31, 2021
Proceeds from Issuance of Commercial Paper     $ 2,800,000        
Repayments of Commercial Paper     $ 3,000,000        
Commercial Paper, Maturity Duration, Minimum (Day)     7 days        
Commercial Paper Maturity Duration, Maximum (Day)     86 days        
Commercial Paper     $ 200,000        
Board of Directors Authorized Debt Issuance         $ 12,000,000    
Previous Board of Directors Remaining Debt Issuance           $ 2,500,000  
Board of Directors Remaining Debt Issuance     6,600,000        
Secured Debt [Member]              
Long-Term Debt, Gross     $ 200,000       $ 300,000
4.950% Notes, Due September 9, 2052 [Member]              
Debt Instrument, Interest Rate, Stated Percentage       4.95%      
4.163% Notes, Due July 15, 2022 [Member]              
Debt Instrument, Interest Rate, Stated Percentage 4.163%            
Debt Instrument, Repurchase Amount $ 750,000            
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 100.00%            
Debt Instrument, Repurchase Date Apr. 15, 2022            
Commercial Paper [Member]              
Debt, Weighted Average Interest Rate     2.90%        
Revolving Credit Facility [Member]              
Line of Credit Facility, Remaining Borrowing Capacity   $ 2,000,000 $ 2,000,000        
Proceeds from Lines of Credit, Total     0        
Allowable Debt Per Debt to Net Worth Coverage Ratio as Defined Facility     48,300,000        
Outstanding Debt as Defined by Facility     35,200,000        
Cross Default Provision as Defined By Facility     $ 150,000        
Line of Credit Facility, Expiration Date   Jun. 08, 2023 May 20, 2027