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Note 2 - Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Inputs, Level 1 [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member]
Assets, fair value
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Assets, fair value
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Assets, fair value
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Assets, fair value
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial and Industrial Portfolio Segment [Member]
Assets, fair value
Fair Value, Inputs, Level 1 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member]
Assets, fair value
Fair Value, Inputs, Level 1 [Member] | Derivative Financial Instruments, Assets [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member]
Assets, fair value
Liabilities, fair value
Fair Value, Inputs, Level 1 [Member] | Other Real Estate Owned [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Assets, fair value
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member]
Assets, fair value	16,689	16,630
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Assets, fair value
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Assets, fair value
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Assets, fair value
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial and Industrial Portfolio Segment [Member]
Assets, fair value
Fair Value, Inputs, Level 2 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member]
Assets, fair value	93,592	85,534
Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Assets [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member]
Assets, fair value	237	101
Liabilities, fair value	(237)	(101)
Fair Value, Inputs, Level 2 [Member] | Other Real Estate Owned [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Assets, fair value	228	228
Fair Value, Inputs, Level 3 [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member]
Assets, fair value
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Assets, fair value	1,206
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Assets, fair value	263	264
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Assets, fair value	156
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial and Industrial Portfolio Segment [Member]
Assets, fair value	1,898
Fair Value, Inputs, Level 3 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member]
Assets, fair value
Fair Value, Inputs, Level 3 [Member] | Derivative Financial Instruments, Assets [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member]
Assets, fair value
Liabilities, fair value
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Assets, fair value

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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X

- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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