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Note 19 - Tax Credit Investments (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Investment, Proportional Amortization Method, Elected, Amount | $ 31,340,000 |  | $ 31,340,000 |  | $ 22,000,000
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, after Amortization Expense | 666,000 | $ 602,000 | 1,800,000 | $ 1,600,000 |
Investment Program, Proportional Amortization Method, Elected, Impairment Loss |  |  | 0 | 0 |
Affordable Housing Tax Credits [Member] |  |  |  |  |
Investment, Proportional Amortization Method, Elected, Amount | 26,500,000 |  | 26,500,000 |  | 22,000,000
Investment Program, Proportional Amortization Method, Elected, Commitment | 16,500,000 |  | 16,500,000 |  | 13,900,000
Investment Program, Proportional Amortization Method, Applied, Amortization Expense | 539,000 | $ 513,000 | 1,500,000 | $ 1,300,000 |
Solar Investment Tax Credit [Member] |  |  |  |  |
Investment, Proportional Amortization Method, Elected, Amount | 4,800,000 |  | 4,800,000 |  | $ 0
Investment Program, Proportional Amortization Method, Elected, Commitment | 3,900,000 |  | 3,900,000 |  |
Investment Program, Proportional Amortization Method, Applied, Amortization Expense | 2,400,000 |  | 4,800,000 |  |
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, after Amortization Expense | $ 2,600,000 |  | 5,200,000 |  |
Investment Program, Proportional Amortization Method, Elected, Impairment Loss |  |  | $ 0 |  |

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- Definition Amount of impairment loss for investment that generates income tax credit and other income tax benefit under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, investment under tax credit program not meeting condition for accounting under proportional amortization method. + References Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 740 -SubTopic 323 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478156/740-323-50-2 + Details
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- Definition Amount of investment that generates income tax credit and other income tax benefit under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, investment under program not meeting condition for accounting under proportional amortization method. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 740 -SubTopic 323 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478156/740-323-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 323 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478156/740-323-50-1A + Details
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- Definition Amount, after amortization expense, of income tax credit and other income tax benefit generated by investment under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, investment under tax credit program not meeting condition for accounting under proportional amortization method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 323 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478156/740-323-50-1A + Details
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- Definition Amount of commitment and contingent commitment, including amount of delayed equity contribution, for investment that generates income tax credit and other income tax benefit under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, commitment and contingent commitment related to investment under tax credit program not meeting condition for accounting under proportional amortization method. + References Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 740 -SubTopic 323 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478156/740-323-50-2 + Details
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