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Note 7 - Variable Interest Entities (VIEs) (Details Textual) | 12 Months Ended |
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Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Loan [Member] |  |
Limited Partners' Capital Account | $ 0 | $ 2,022,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Limited Partners' Capital Account | 42,800,000 | $ 46,300,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Federal Historic Tax Credit Partnerships [Member] |  |
Limited Partners' Capital Account | $ 754,000 |
Variable Interest Entity, Number of Investments | 2 |
Limited Partners' Contributed Capital | $ 2,400,000 |
Variable Interest Entity, Not Primary Beneficiary [Member] | Low-Income Housing Tax Credit Partnerships [Member] |  |
Limited Partners' Capital Account | $ 7,800,000 |
Variable Interest Entity, Number of Investments | 6 |

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- Definition Information on the number of investments held. + References No definition available. + Details
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Period Type: | duration

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- Definition The amount of the limited partners' ownership interests. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-5 + Details
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- Definition The amount of capital contributed by the limited partners. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-5 + Details
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- Details
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- Details
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