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Note 4 - Loans Receivable and Allowance for Loan Losses - Non-accrual Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Non-accruing loans	$ 5,036	$ 3,778
Commercial Real Estate Portfolio Segment [Member]
Non-accruing loans	474
Residential Portfolio Segment [Member]
Non-accruing loans	3,037	3,028
Commercial Portfolio Segment [Member]
Non-accruing loans	1,521	748
Substandard [Member]
Non-accruing loans	5,036	3,778
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Non-accruing loans	474
Substandard [Member] | Residential Portfolio Segment [Member]
Non-accruing loans	3,037	3,028
Substandard [Member] | Commercial Portfolio Segment [Member]
Non-accruing loans	1,521	748
Substandard [Member] | Consumer and Other Portfolio Segment [Member]
Non-accruing loans	4	2
Substandard [Member] | Non-Accrual Loans [Member]
Performing (accruing) loans, past due	5,036	3,778
Performing (accruing) loans, current	0	0
Substandard [Member] | Non-Accrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due	474
Performing (accruing) loans, current	0
Substandard [Member] | Non-Accrual Loans [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due	3,037	3,028
Performing (accruing) loans, current	0	0
Substandard [Member] | Non-Accrual Loans [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	1,521	748
Performing (accruing) loans, current	0	0
Substandard [Member] | Non-Accrual Loans [Member] | Consumer and Other Portfolio Segment [Member]
Performing (accruing) loans, past due	4	2
Performing (accruing) loans, current	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member]
Performing (accruing) loans, past due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Consumer and Other Portfolio Segment [Member]
Performing (accruing) loans, past due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member]
Performing (accruing) loans, past due	6	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	6	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Consumer and Other Portfolio Segment [Member]
Performing (accruing) loans, past due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member]
Performing (accruing) loans, past due	5,030	3,778
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due	474
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due	3,037	3,028
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	1,515	748
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member] | Non-Accrual Loans [Member] | Consumer and Other Portfolio Segment [Member]
Performing (accruing) loans, past due	$ 4	$ 2

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- Definition

Financing receivables that are current.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
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