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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 |  |  |

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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. + References No definition available. + Details
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