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Note 5 - Loans and Allowance for Loan Losses (Details Textual) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Financing Receivable Number Of Loans90 Days Past Due And Still Accruing | $ 0 |  | $ 0 |  | $ 0
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total | $ 0 | $ 0 | $ 0 | $ 0 |
Number Of Loans Identified As Troubled Debt Restructurings | 6 |  | 6 |  | 4
Financing Receivable, Troubled Debt Restructuring | $ 3.1 |  | $ 3.1 |  | $ 1,800,000
Financing Receivable, Nonaccrual Troubled Debt Restructuring | 1.1 |  | 1.1 |  | 0
Allowance For Credit Losses Reserve, Change In Method Of Calculating Impairment | 26,634,000 | $ 19,386,000 | 26,634,000 | $ 19,386,000 | 18,816,000
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | $ 0 |  | $ 0 |  | 0
Financing Receivable, Modifications, Number of Contracts | 1 | 0 | 3 | 1 |
Specific Reserve [Member] |  |  |  |  |
Allowance For Credit Losses Reserve, Change In Method Of Calculating Impairment | $ 436,000 | $ 430,000 | $ 436,000 | $ 430,000 | 0
Specific Reserve [Member] | One Loan [Member] |  |  |  |  |
Allowance For Credit Losses Reserve, Change In Method Of Calculating Impairment | $ 0 |  | $ 0 |  | $ 0

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- Definition Financing receivable nonaccrual troubled debt restructuring. + References No definition available. + Details
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- Definition Financing receivable number of loans 90 days past due and still accruing. + References No definition available. + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
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- Definition Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524 + Details
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- Definition Amount of unfunded portion of contractual agreement to lend funds to borrower for financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18794-111554 + Details
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