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Note 21 - Qualified Affordable Housing Project Investments (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Amortization Method Qualified Affordable Housing Project Investments | $ 7,900,000 |  | $ 7,900,000 |  | $ 8,600,000
Qualified Affordable Housing Project Investments, Commitment | 2,000,000.0 |  | 2,000,000.0 |  | $ 4,200,000
Amortization Method Qualified Affordable Housing Project Investments, Amortization | $ 247,000 | $ 225,000 | $ 740,000 | $ 675,000 |
Minimum [Member] |  |  |  |  |
Affordable Housing Tax Credits Commitment, Year to be Paid |  |  | 2020 |  |
Maximum [Member] |  |  |  |  |
Affordable Housing Tax Credits Commitment, Year to be Paid |  |  | 2027 |  |

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- Definition Year in which contingent commitments to qualified affordable housing project investments are expected to be paid, in CCYY format. + References No definition available. + Details
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- Definition Amount of investment in qualified affordable housing projects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985 + Details
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- Definition Amount of amortization expense of investment in qualified affordable housing projects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985 + Details
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- Definition Amount of commitment or contingent commitments to qualified affordable housing project investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985 + Details
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