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Note 6 - Investments in Affordable Housing and Alternative Energy Partnerships (Details Textual) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Investments in Affordable Housing and Alternative Energy Partnerships | $ 272,900 | $ 282,700 | $ 272,900 |
Number Of Limited Partnerships In Housing Investments |  | 8 |  |
Increase in Total Assets and Liabilities from Consolidating Affordable Housing Equity Interest |  | $ 23,800 | 23,600 |
Alternative Energy Tax Credit Partnership Investments, Net | 12,759 | 23,688 | 12,759 |
Alternative Energy Tax Credit Partnership Investments, Held in Escrow |  | 7,800 |  |
Solar Tax Credits Expected to Be Realized |  | 8,000 |  |
Asset Impairment Charges, Total |  | (289) | 874 | $ 1,307
Low income Housing Tax Credit Investments, Pretax Write-down | $ 2,600 |  | $ 2,600 |
Affordable Housing Limited Partnerships [Member] |  |  |  |
Asset Impairment Charges, Total |  | 4,500 |  |
Affordable Housing Limited Partnerships [Member] | Domestic Tax Authority [Member] |  |  |  |
Remaining and Future Available Tax Credit |  | 200,500 |  |
Affordable Housing Limited Partnerships [Member] | State and Local Jurisdiction [Member] |  |  |  |
Remaining and Future Available Tax Credit |  | $ 1,800 |  |

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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 Number of limited Partnerships in housing investments. + 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=109223946&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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