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Note 5 - Loans Receivable and Allowance for Loan Losses (Details Textual) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | May 10, 2018 USD ($) | Dec. 31, 2017 USD ($)
Loans Receivable, Net, Total |  | $ 750,804,000 |  | $ 750,804,000 |  |  | $ 713,350,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  |  |  |  |  | $ 2,400,000 |
Payments to Acquire Loans Receivable |  |  |  |  | $ 73,022,000 |  |
Maximum Period of Credit Extension of Construction Loans |  |  |  | 1 year 180 days |  |  |
Loans Receivable, Term to Reset to FHLB Rate |  |  |  | 5 years |  |  |
Certain Loans Acquired, Individually Evaluated for Impairment |  | 21,900,000 |  | $ 21,900,000 |  |  |
Period for Charged Off of Open-End Credits |  |  |  | 180 days |  |  |
Period for Charged Off of Close-End Credits |  |  |  | 120 days |  |  |
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans |  | 103,000 | $ 22,000 | $ 176,000 | 43,000 |  |
Threshold Period Past Due for Write-off of Financing Receivable |  |  |  | 90 days |  |  |
Maximum Period for Charged Off of Consumer Installment Loans |  |  |  | 180 days |  |  |
Performance Period Under Loan Terms |  |  |  | 180 days |  |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 2,900,000 |  | $ 2,900,000 |  |  | 3,000,000
Financing Receivable, Modifications, Number of Contracts |  | 0 | 0 |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts |  | 0 | 0 |  |  |  |
Loans and Leases Receivable, Impaired, Commitment to Lend |  | $ 0 |  | 0 |  |  | 0
Impaired Financing Receivable, Recorded Investment, Total |  | 9,400,000 |  | 9,400,000 |  |  | 6,800,000
Impaired Financing Receivable, Related Allowance |  | $ 45,000 |  | $ 45,000 |  |  | $ 253,000
Number of Impaired Loans |  | 14 |  | 14 |  |  | 12
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses |  |  |  |  |  | 0 |
Non-Accrual Loans [Member] |  |  |  |  |  |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total |  | $ 0 | $ 0 | $ 0 | $ 0 |  |
Acquired Loans [Member] |  |  |  |  |  |  |
Loans Receivable, Net, Total |  | $ 21,908,000 |  | $ 21,908,000 |  | 21,600,000 |
Acquired Loans [Member] | Financial Asset Acquired and No Credit Deterioration [Member] |  |  |  |  |  |  |
Loans Receivable, Net, Total |  |  |  |  |  | 19,200,000 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |
Maximum Percentage of Credit Extension Based on Market Value of Collateral |  |  |  | 75.00% |  |  |
Multi-family Real Estate [Member] |  |  |  |  |  |  |
Maximum Percentage of Credit Extension Based on Market Value of Collateral |  |  |  | 80.00% |  |  |
Construction Portfolio Segment [Member] |  |  |  |  |  |  |
Percentage of Maximum Loan to Value |  |  |  | 75.00% |  |  |
Residential Portfolio Segment [Member] |  |  |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  |  |  |  |  | 400,000 |
Payments to Acquire Loans Receivable | $ 73,000,000 |  |  | $ 0 |  |  |
Receivable with Imputed Interest, Premium | $ 985,000 |  |  |  |  |  |
Construction to Permanent Portfolio Segment [Member] | Minimum [Member] |  |  |  |  |  |  |
Loans Receivable, Term |  |  |  | 20 years |  |  |
Construction to Permanent Portfolio Segment [Member] | Maximum [Member] |  |  |  |  |  |  |
Loans Receivable, Term |  |  |  | 25 years |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  |  |  |  |  | $ 2,000,000 |

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- Definition Period of time between issuance and maturity of loan receivable, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Period of time that a loan receivable takes to reset to the FHLB rate, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was 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=82894507&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 (b)(2) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + 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=82894903&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=82894507&loc=d3e13503-111538 + Details
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- Definition Amount of interest income recognized on a cash-basis method of accounting 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)(3) -URI http://asc.fasb.org/extlink&oid=84173941&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=82895541&loc=d3e18794-111554 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes 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(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Disclosure of the unamortized amount of the premium on the note or receivable which is added to the face amount of the receivable or loan. The discount or premium is defined as the difference between the present value and the face amount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 + Details
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