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Note 5 - Loans and Allowance for Loan Losses (Details Textual) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 01, 2018 USD ($) | Aug. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Number of Portfolio Segments | 9 |  |  |  |
Loans Pledged as Collateral | $ 20,400 | $ 27,000 |  |  |
Loans and Leases Receivable, Related Parties, Ending Balance | 900 | 800 |  |  |
Loans and Leases Receivable, Related Parties, Additions | 100 | 500 |  |  |
Loans and Leases Receivable, Related Parties, Proceeds | 1 | 200 |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance, Total |  |  |  | $ 2,900 |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  |  | $ 2,831 | $ 2,800 |
Certain Loans Acquired in Transfer, Accretable Yield | 0 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition | 0 |  |  |  |
Loans and Leases Receivable, Gross, Total | 513,133 | 525,870 |  |  |
Financing Receivable, Nonaccrual | 1,864 | 2,759 |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,666 | 708 |  |  |
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans | 12 | 44 |  |  |
Interest Income Recorded | 6 | 27 |  |  |
Financing Receivable, Troubled Debt Restructuring | 0 | 0 |  |  |
Financing Receivable, Restructuring Recorded Investment With Nonaccrual Status | $ 100 | $ 100 |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | 0 | 0 |  |  |
Loans Modified in a Troubled Debt Restructuring, Individually Evaluated for Impairment, Principal Balance, Threshold | $ 500 |  |  |  |
Loans and Leases Receivable, Allowance, Ending Balance | 4,924 | $ 5,055 |  |  | $ 4,774
Restructured Loan [Member] |  |  |  |  |
Loans and Leases Receivable, Allowance, Ending Balance | 1 | 2 |  |  |
ALC [Member] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 200 | 200 |  |  |
Minimum [Member] |  |  |  |  |
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest |  | 500 |  |  |
Minimum [Member] | ALC [Member] |  |  |  |  |
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest |  | 50 |  |  |
Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Loans and Leases Receivable, Gross, Total | 260 | 497 |  |  |
Financing Receivable, Nonaccrual | 300 | 500 |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 300 | 500 |  |  |
Loans and Leases Receivable, Allowance, Ending Balance |  |  |  |  |
Financial Asset Acquired with Credit Deterioration [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |
Loans and Leases Receivable, Gross, Total | 100 | 300 |  |  |
Financial Asset Acquired with Credit Deterioration [Member] | Substandard [Member] |  |  |  |  |
Loans and Leases Receivable, Gross, Total | $ 300 | $ 500 |  |  |
Real Estate [Member] |  |  |  |  |
Percentage of Loan Portfolio | 62.30% | 63.20% |  |  |

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- Definition The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538 + Details
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- Definition The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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