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Note 9 - Interest Rate Swaps - Interest Rate Swap Agreements (Details) - Cash Flow Hedging [Member] $ in Millions | Sep. 30, 2021 USD ($)
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First Interest Rate Swap Agreement [Member] |
Derivative, Notional Amount | $ 850
Derivative, Fixed Interest Rate | 2.65%
Second Interest Rate Swap Agreement [Member] |
Derivative, Notional Amount | $ 350
Derivative, Fixed Interest Rate | 2.74%
Interest Rate Swap [Member] |
Derivative, Notional Amount | $ 1,200

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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |