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Note 3 - Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Due in one year or less, available for sale, amortized cost
Due in one year or less, available for sale, fair value
Due in one year or less, held to maturity, amortized cost	926
Due in one year or less, held to maturity, fair value	927
Due in over one to five years, available for sale, amortized cost	16,677
Due in over one to five years, available for sale, fair value	16,689
Due in over one to five years, held to maturity, amortized cost	6,431
Due in over one to five years, held to maturity, fair value	6,601
Due in over five to ten years, available for sale, amortized cost
Due in over five to ten years, available for sale, fair value
Due in over five to ten years, held to maturity, amortized cost	8,230
Due in over five to ten years, held to maturity, fair value	8,593
Due after ten years, available for sale, amortized cost
Due after ten years, available for sale, fair value
Due after ten years, held to maturity, amortized cost
Due after ten years, held to maturity, fair value
Agency mortgage-backed securities, residential, available for sale, amortized cost	94,310
Agency mortgage-backed securities, residential, available for sale, fair value	93,592
Agency mortgage-backed securities, residential, held to maturity, amortized cost	3
Agency mortgage-backed securities, residential, held to maturity, fair value	3
Total debt securities, available for sale, amortized cost	110,987	$ 104,867
Total debt securities, available for sale, fair value	110,281	102,164
Total debt securities, held to maturity, amortized cost	15,590	15,816
Total debt securities, held to maturity, fair value	$ 16,124	$ 16,234

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Amortized cost of investment in debt security measured at amortized cost (held-to-maturity), without single maturity date and not allocated over maturity grouping.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563

+ Details

Name:	us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563

+ Details

Name:	us-gaap_HeldToMaturitySecuritiesFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant