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Note 3 - Loan Receivables and Allowance for Loan Losses - Allowance for Loan Losses to Loan Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Dec. 31, 2016
Balance	$ 4,675	$ 5,242
Charge-offs	0	(5)
Recoveries	2,771	10
Provisions (credits)	(1,749)	0
Balance	5,697	5,247
Allowance for loan losses: Individually evaluated for impairment			$ 232	$ 231
Allowance for loan losses: Collectively evaluated for impairment			5,465	4,444
Total allowance for loan losses	5,697	5,242	5,697	4,675
Loans receivable, gross: Individually evaluated for impairment			8,885	8,951
Loans receivable, gross: Collectively evaluated for impairment			621,842	572,706
Total loans receivable, gross			630,727	581,657
Commercial Real Estate Portfolio Segment [Member]
Balance	1,853	1,970
Charge-offs	0	0
Recoveries	2	0
Provisions (credits)	343	(27)
Balance	2,198	1,943
Allowance for loan losses: Individually evaluated for impairment			0	0
Allowance for loan losses: Collectively evaluated for impairment			2,198	1,853
Total allowance for loan losses	1,853	1,970	2,198	1,853
Loans receivable, gross: Individually evaluated for impairment			6,204	6,267
Loans receivable, gross: Collectively evaluated for impairment			259,064	264,962
Total loans receivable, gross			265,268	271,229
Residential Portfolio Segment [Member]
Balance	534	740
Charge-offs	0	(5)
Recoveries	0	0
Provisions (credits)	539	(111)
Balance	1,073	624
Allowance for loan losses: Individually evaluated for impairment			0	0
Allowance for loan losses: Collectively evaluated for impairment			1,073	534
Total allowance for loan losses	534	740	1,073	534
Loans receivable, gross: Individually evaluated for impairment			1,908	1,911
Loans receivable, gross: Collectively evaluated for impairment			153,232	84,603
Total loans receivable, gross			155,140	86,514
Commercial Portfolio Segment [Member]
Balance	740	1,027
Charge-offs	0	0
Recoveries	2,769	9
Provisions (credits)	(2,460)	47
Balance	1,049	1,083
Allowance for loan losses: Individually evaluated for impairment			232	231
Allowance for loan losses: Collectively evaluated for impairment			817	509
Total allowance for loan losses	740	1,027	1,049	740
Loans receivable, gross: Individually evaluated for impairment			232	231
Loans receivable, gross: Collectively evaluated for impairment			62,143	60,746
Total loans receivable, gross			62,375	60,977
Consumer Portfolio Segment [Member]
Balance	641	677
Charge-offs	0	0
Recoveries	0	1
Provisions (credits)	(58)	(69)
Balance	583	609
Allowance for loan losses: Individually evaluated for impairment			0	0
Allowance for loan losses: Collectively evaluated for impairment			583	641
Total allowance for loan losses	641	677	583	641
Loans receivable, gross: Individually evaluated for impairment			541	542
Loans receivable, gross: Collectively evaluated for impairment			95,352	100,907
Total loans receivable, gross			95,893	101,449
Construction Portfolio Segment [Member]
Balance	712	486
Charge-offs	0	0
Recoveries	0	0
Provisions (credits)	(121)	164
Balance	591	650
Allowance for loan losses: Individually evaluated for impairment			0	0
Allowance for loan losses: Collectively evaluated for impairment			591	712
Total allowance for loan losses	712	486	591	712
Loans receivable, gross: Individually evaluated for impairment			0	0
Loans receivable, gross: Collectively evaluated for impairment			44,512	53,895
Total loans receivable, gross			44,512	53,895
Construction to Permanent Portfolio Segment [Member]
Balance	69	123
Charge-offs	0	0
Recoveries	0	0
Provisions (credits)	8	(2)
Balance	77	121
Allowance for loan losses: Individually evaluated for impairment			0	0
Allowance for loan losses: Collectively evaluated for impairment			77	69
Total allowance for loan losses	69	123	77	69
Loans receivable, gross: Individually evaluated for impairment			0	0
Loans receivable, gross: Collectively evaluated for impairment			7,539	7,593
Total loans receivable, gross			7,539	7,593
Unallocated Financing Receivables [Member]
Balance	126	219
Charge-offs	0	0
Recoveries	0	0
Provisions (credits)		(2)
Balance	126	217
Allowance for loan losses: Individually evaluated for impairment			0	0
Allowance for loan losses: Collectively evaluated for impairment			126	126
Total allowance for loan losses	$ 126	$ 219	126	126
Loans receivable, gross: Individually evaluated for impairment			0	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))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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X

- 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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- Definition

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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X

- 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
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

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
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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X

- 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)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: 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))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L.1)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 2
-Subparagraph (b)(1)(ii)
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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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X

- 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)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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