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Note 4 - Loans Receivables and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016
Balance	$ 4,675	$ 5,242	$ 4,924
Charge-offs	(304)	(3,180)	(32)
Recoveries	2,783	149	100
Provisions (credits)	(857)	2,464	250
Balance	6,297	4,675	5,242
Allowance for loan losses: Individually evaluated for impairment				$ 253	$ 231
Allowance for loan losses: Collectively evaluated for impairment				6,044	4,444
Total allowance for loan losses	6,297	4,675	5,242	6,297	4,675
Loans receivable, gross: Individually evaluated for impairment				6,753	8,951
Loans receivable, gross: Collectively evaluated for impairment				712,894	572,706
Total loans receivable, gross				719,647	581,657
Commercial Real Estate Portfolio Segment [Member]
Balance	1,853	1,970	1,204
Charge-offs	0	0
Recoveries	10	80	35
Provisions (credits)	349	(197)	731
Balance	2,212	1,853	1,970
Allowance for loan losses: Individually evaluated for impairment				0	0
Allowance for loan losses: Collectively evaluated for impairment				2,212	1,853
Total allowance for loan losses	1,853	1,853	1,970	2,212	1,853
Loans receivable, gross: Individually evaluated for impairment				1,977	6,267
Loans receivable, gross: Collectively evaluated for impairment				297,948	264,962
Total loans receivable, gross				299,925	271,229
Residential Portfolio Segment [Member]
Balance	534	740	949
Charge-offs	0	(190)	(16)
Recoveries	0	1
Provisions (credits)	425	(17)	(193)
Balance	959	534	740
Allowance for loan losses: Individually evaluated for impairment				0	0
Allowance for loan losses: Collectively evaluated for impairment				959	534
Total allowance for loan losses	534	534	740	959	534
Loans receivable, gross: Individually evaluated for impairment				3,336	1,911
Loans receivable, gross: Collectively evaluated for impairment				143,041	84,603
Total loans receivable, gross				146,377	86,514
Commercial Portfolio Segment [Member]
Balance	740	1,027	1,753
Charge-offs	(265)	(2,977)
Recoveries	2,769	66	49
Provisions (credits)	(1,221)	2,624	(775)
Balance	2,023	740	1,027
Allowance for loan losses: Individually evaluated for impairment				251	231
Allowance for loan losses: Collectively evaluated for impairment				1,772	509
Total allowance for loan losses	740	740	1,027	2,023	740
Loans receivable, gross: Individually evaluated for impairment				748	231
Loans receivable, gross: Collectively evaluated for impairment				130,413	60,746
Total loans receivable, gross				131,161	60,977
Consumer Portfolio Segment [Member]
Balance	641	677	638
Charge-offs	(39)	(13)	(16)
Recoveries	4	2	11
Provisions (credits)	(38)	(25)	44
Balance	568	641	677
Allowance for loan losses: Individually evaluated for impairment				2	0
Allowance for loan losses: Collectively evaluated for impairment				566	641
Total allowance for loan losses	641	641	677	568	641
Loans receivable, gross: Individually evaluated for impairment				692	542
Loans receivable, gross: Collectively evaluated for impairment				87,015	100,907
Total loans receivable, gross				87,707	101,449
Construction Portfolio Segment [Member]
Balance	712	486	49
Charge-offs	0	0
Recoveries	0	0
Provisions (credits)	(231)	226	437
Balance	481	712	486
Allowance for loan losses: Individually evaluated for impairment				0	0
Allowance for loan losses: Collectively evaluated for impairment				481	712
Total allowance for loan losses	712	712	486	481	712
Loans receivable, gross: Individually evaluated for impairment					0
Loans receivable, gross: Collectively evaluated for impairment				47,619	53,895
Total loans receivable, gross				47,619	53,895
Construction to Permanent Portfolio Segment [Member]
Balance	69	123	179
Charge-offs	0	0
Recoveries	0	0	5
Provisions (credits)	(15)	(54)	(61)
Balance	54	69	123
Allowance for loan losses: Individually evaluated for impairment				0	0
Allowance for loan losses: Collectively evaluated for impairment				54	69
Total allowance for loan losses	69	69	123	54	69
Loans receivable, gross: Individually evaluated for impairment					0
Loans receivable, gross: Collectively evaluated for impairment				6,858	7,593
Total loans receivable, gross				6,858	7,593
Unallocated Financing Receivables [Member]
Balance	126	219	152
Charge-offs	0	0
Recoveries	0	0
Provisions (credits)	(126)	(93)	67
Balance		126	219
Allowance for loan losses: Individually evaluated for impairment				0	0
Allowance for loan losses: Collectively evaluated for impairment				0	126
Total allowance for loan losses	$ 126	$ 126	$ 219		126
Loans receivable, gross: Individually evaluated for impairment					0
Loans receivable, gross: Collectively evaluated for impairment				0	0
Total loans receivable, gross				$ 0	$ 0

X

- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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X

- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
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- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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The balance of financing receivables that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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X

- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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- Definition

Amount of expense related to estimated loss from loan and lease transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
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-SubTopic 10
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-Paragraph 11B
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