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Note 4 - Loans (Details Textual) | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Loan Balance For Reviewing High Risk Loans Minimum | $ 250,000 |
Impaired Financing Receivable, Interest Income, Accrual Method, Total | 175,000 | $ 320,000
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans | 221,000 | 226,000
Impaired Financing Receivable, Recorded Investment, Total | 23,955,000 | 24,473,000
Impaired Financing Receivable, Related Allowance | 3,155,000 | $ 1,418,000
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | $ 0 |
Financing Receivable, Modifications, Number of Contracts | 0 | 1
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down |  | $ 402,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | 1 | 1
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 859,000 | $ 131,000
Financial Asset Acquired with Credit Deterioration [Member] |  |
Impaired Financing Receivable, Recorded Investment, Total | 147,000 | 0
Impaired Financing Receivable, Related Allowance | $ 6,000 | $ 0

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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=118936363&loc=SL6953676-111524 + Details
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- Definition Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524 + Details
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- Definition Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524 + Details
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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18845-111554 + Details
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- Definition Amount of interest income recognized 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)(2) -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524 + Details
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- Definition Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18794-111554 + Details
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