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Note 4 - Loans and Allowance for Loan Losses (Details Textual) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 USD ($) | May 07, 2020 USD ($) | Dec. 31, 2019 USD ($)
Increase (Decrease) in Other Loans | $ (826,000) |  |  |  |  |
Change In Troubled Debt Restructurings | 9.70% |  |  |  |  |
Impaired Financing Receivable, Related Allowance | $ 854,000 |  |  |  |  | $ 807,000
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | $ 1,516,000 |  |  |  |  | 941,000
Financing Receivable, Modifications, Number of Contracts |  | 2 | 0 |  |  |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down |  |  |  | $ 0 |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts |  |  |  | 0 |  |
Financing Receivable, Number of Principal and Interest Payment | 95 |  |  |  | 593 |
Financing Receivable, Principal and Interest Deferred Payments | $ 15,934 |  |  |  | $ 128,262 |
Minimum Loan Balance For Loans Evaluated by Risk Categories |  |  |  |  |  | 750,000
Troubled Debt Restructurings [Member] |  |  |  |  |  |
Impaired Financing Receivable, Related Allowance | $ 450,000 |  |  |  |  | $ 227,000
Unsecured [Member] |  |  |  |  |  |
Percentage of Loan Portfolio | 5.13% |  |  |  |  | 5.00%
Residential Portfolio Segment [Member] |  |  |  |  |  |
Real Estate Acquired Through Foreclosure | $ 0 |  |  |  |  | $ 68,000
Mortgage Loans in Process of Foreclosure, Amount | $ 831,000 |  |  |  |  | $ 1,780,000

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- Definition Number of principal and interest payment deferrals on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19. + References No definition available. + Details
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- Definition Deferred amounts of principal and interest payments on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19. + 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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