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Note 5 - Investments in Affordable Housing and Alternative Energy Partnerships (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Investments in Affordable Housing and Alternative Energy Partnerships | $ 309,000 | $ 308,700 |
Number of Limited Partnerships Deemed to be Variable Interest Entities | 10 |  |
Increase in Total Assets and Liabilities from Consolidating Affordable Housing Equity Interest | $ 31,400 | 36,300 |
Alternative Energy Tax Credit Partnership Investments, Net | 29,035 | 32,175 |
Alternative Energy Tax Credit Partnership Investments, Held in Escrow | 9,300 |  |
Solar Tax Credits Expected to Be Realized | 9,100 |  |
Asset Impairment Charges, Total | 7,836 | 848 | $ (289)
Affordable Housing Limited Partnerships [Member] |  |  |
Asset Impairment Charges, Total | 1,400 | $ 2,100 |
Affordable Housing Limited Partnerships [Member] | Domestic Tax Authority [Member] |  |  |
Remaining and Future Available Tax Credit | 218,600 |  |
Affordable Housing Limited Partnerships [Member] | State and Local Jurisdiction [Member] |  |  |
Remaining and Future Available Tax Credit | $ 3,100 |  |

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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 The amount of solar tax credits expected to be realized. + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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