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Note 5 - Loans Receivable and Allowance for Loan Losses - Recorded Investment in TDRs (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
TDR Loan | $ 2,900,000 | $ 3,000,000
Business Activities Loans [Member] |  |
TDR Loan | 2,905,000 | 2,976,000
Business Activities Loans [Member] | Non-Accrual Loans [Member] |  |
TDR Loan |  |
Business Activities Loans [Member] | Accrual Loans [Member] |  |
TDR Loan | 2,905,000 | 2,976,000
Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member] |  |
TDR Loan | 1,916,000 | 1,977,000
Residential Portfolio Segment [Member] | Business Activities Loans [Member] |  |
TDR Loan | $ 989,000 | $ 999,000

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + 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=82895541&loc=d3e18845-111554 + Details
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