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Note 14 - Debt (Details Textual) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
	Apr. 15, 2022	Jun. 30, 2022	Jun. 30, 2022	Feb. 03, 2022	Feb. 02, 2022	Dec. 31, 2021
Proceeds from Issuance of Commercial Paper			$ 2,000,000
Repayments of Commercial Paper			$ 2,200,000
Commercial Paper, Maturity Duration, Minimum (Day)			7 days
Commercial Paper Maturity Duration, Maximum (Day)			86 days
Commercial Paper		$ 250,000	$ 250,000
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		8,500,000	8,500,000
Secured Debt [Member]
Long-Term Debt, Gross		$ 600,000	$ 600,000			$ 300,000
4.163% Notes, Due July 15, 2022 [Member]
Debt Instrument, Repurchase Date	Apr. 15, 2022
Debt Instrument, Repurchase Amount	$ 750,000
Debt Instrument, Interest Rate, Stated Percentage	4.163%
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed	100.00%
Commercial Paper [Member]
Debt, Weighted Average Interest Rate		1.50%	1.50%
Revolving Credit Facility [Member]
Line of Credit Facility, Remaining Borrowing Capacity		$ 2,000,000	$ 2,000,000
Line of Credit Facility, Expiration Date		Jun. 08, 2023	May 20, 2027
Proceeds from Lines of Credit, Total			$ 0
Allowable Debt Per Debt to Net Worth Coverage Ratio as Defined Facility		$ 47,000,000	47,000,000
Outstanding Debt as Defined by Facility		33,800,000	33,800,000
Cross Default Provision as Defined By Facility		$ 150,000	$ 150,000

X

- Definition

Total amount of debt (as defined in the facility) the debt-to-net-worth coverage ratio allowable under the revolving credit facility.

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- Definition

Maximum duration of commercial paper maturities, in 'PnYnMnDTnHnMnS' format, for example, P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Cross-default provision, as defined by facility.

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Outstanding debt as defined by the credit facility.

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Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage of principal amount of debt redeemed.

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Fair value amount of debt instrument that was repurchased.

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Weighted average interest rate of debt outstanding.

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Date the credit facility terminates, in YYYY-MM-DD format.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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