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Note 4 - Credit Quality - Loans Modified as Troubled Debt Restructurings (Details) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Total contracts		1	1	2	3
Pre-modification recorded investment		$ 11	$ 42	$ 52	$ 141
Post-modification recorded investment	[1]	$ 11	$ 42	$ 52	$ 141
Below Market Interest Rate [Member] | Single Family Owner Occupied [Member]
Total contracts		1		1
Pre-modification recorded investment		$ 11		$ 11
Post-modification recorded investment	[1]	$ 11		$ 11
Below Market Interest Rate and Extended Payment Term [Member] | Single Family Owner Occupied [Member]
Total contracts			1	1	3
Pre-modification recorded investment			$ 42	$ 41	$ 141
Post-modification recorded investment	[1]		$ 42	$ 41	$ 141
[1] Represents the loan balance immediately following modification

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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X

- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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X

- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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