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Note 6 - Investments in Affordable Housing and Alternative Energy Partnerships (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Investments in Affordable Housing and Alternative Energy Partnerships | $ 315,700 | $ 327,100 |
Number of Limited Partnerships Deemed to be Variable Interest Entities | 11 |  |
Increase in Total Assets and Liabilities from Consolidating Affordable Housing Equity Interest | $ 25,300 | 31,300 |
Alternative Energy Tax Credit Partnership Investments, Net | 19,943 | 37,208 |
Alternative Energy Tax Credit Partnership Investments, Held in Escrow | 6,400 | 25,400 |
Asset Impairment Charges | 4,296 | 4,145 | $ 1,172
Affordable Housing Limited Partnerships [Member] |  |  |
Asset Impairment Charges | 7,700 | $ 6,200 |
Domestic Tax Authority [Member] |  |  |
Remaining and Future Available Tax Credit | 249,600 |  |
State and Local Jurisdiction [Member] |  |  |
Remaining and Future Available Tax Credit | $ 6,200 |  |

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- Definition The amount of alternative energy tax credit partnership investments being held in escrow. + References No definition available. + Details
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- Definition Represents the net investments in the alternative energy tax credit partnership. + References No definition available. + Details
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- Definition Increase in total assets and liabilities from consolidating affordable housing equity interest. + References No definition available. + Details
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- Definition The amount of investments in affordable housing and alternative energy partnerships. + References No definition available. + Details
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- Definition Represents the number of limited partnerships deemed to be variable interest entities. + References No definition available. + Details
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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482130/360-10-45-4 + Details
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