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Note 4 - Loans and Allowance for Loan Losses (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Allowance for Loan and Lease Losses, Period Increase (Decrease) | $ 93 | $ 14 | $ (42) | $ (1,105) | $ (1,112)
Allowance for Loan and Lease Losses, Write-offs | 78 | $ 11 | 391 | 11 | 11
Increase (Decrease) in Other Loans |  |  | $ 802 |  |
Change In Troubled Debt Restructurings |  |  | 5.00% |  |
Impaired Financing Receivable, Related Allowance | 240 |  | $ 240 |  | 2,981
Loans and Leases Receivable, Impaired, Commitment to Lend | $ 1,747 |  | $ 1,747 |  | $ 2,427
Financing Receivable, Modifications, Number of Contracts | 1 | 0 | 4 |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts |  |  | 0 |  |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment |  |  |  | $ 226 |
Minimum Loan Balance For Loans Evaluated by Risk Categories | $ 500 |  | $ 500 |  |
Troubled Debt Restructurings [Member] |  |  |  |  |
Percentage of Loan Portfolio | 86.00% |  | 86.00% |  | 82.00%
Impaired Financing Receivable, Related Allowance | $ 113 |  | $ 113 |  | $ 546
Unsecured [Member] |  |  |  |  |
Percentage of Loan Portfolio | 4.92% |  | 4.92% |  | 5.61%
Residential Portfolio Segment [Member] |  |  |  |  |
Real Estate Acquired Through Foreclosure | $ 384 |  | $ 384 |  | $ 938
Mortgage Loans in Process of Foreclosure, Amount | 1,979 |  | 1,979 |  | $ 1,492
Impaired Financing Receivable, Related Allowance | $ 127 |  | $ 127 |  |
Financing Receivable, Modifications, Number of Contracts |  |  | 1 |  |

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- Definition Minimum loan balance for impaired loans on nonaccrual status or nonperforming in nature. + References No definition available. + Details
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- Definition Amount of increase (decrease) of allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + 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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524 + Details
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524 + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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- Definition Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18794-111554 + Details
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