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Note 4 - Loan Receivables and Allowance for Loan Losses - Allowance for Loan Losses to Loan Portfolio Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015
Loans receivable, gross: Individually evaluated for impairment				$ 8,951	$ 12,851
Loans receivable, gross: Collectively evaluated for impairment				(572,706)	(471,518)
Loans receivable, gross				581,657	484,369
Balance	$ 5,242	$ 4,924	$ 5,681
Charge-offs	(3,180)	(32)	(867)
Recoveries	149	100	110
Provision	2,464	250
Balance	4,675	5,242	4,924
Loans receivable, net				576,982	479,127
Allowance for loan losses: Individually evaluated for impairment				231	3
Allowance for loan losses: Collectively evaluated for impairment				4,444	5,239
Total Allowance for loan losses	4,675	5,242	4,924	4,675	5,242
Loans receivable, gross: Collectively evaluated for impairment				572,706	471,518
Commercial Real Estate Portfolio Segment [Member]
Loans receivable, gross: Individually evaluated for impairment				6,267	7,745
Loans receivable, gross: Collectively evaluated for impairment				(264,962)	(238,083)
Loans receivable, gross				271,229	245,828
Balance	1,970	1,204	1,406
Charge-offs		0	(297)
Recoveries	80	35	60
Provision	(197)	731	35
Balance	1,853	1,970	1,204
Loans receivable, net				269,376	243,858
Allowance for loan losses: Individually evaluated for impairment
Allowance for loan losses: Collectively evaluated for impairment				1,853	1,970
Total Allowance for loan losses	1,970	1,970	1,204	1,853	1,970
Loans receivable, gross: Collectively evaluated for impairment				264,962	238,083
Residential Portfolio Segment [Member]
Loans receivable, gross: Individually evaluated for impairment				1,911	4,556
Loans receivable, gross: Collectively evaluated for impairment				(84,603)	(106,281)
Loans receivable, gross				86,514	110,837
Balance	740	949	974
Charge-offs	(190)	(16)	(195)
Recoveries	1		30
Provision	(17)	(193)	140
Balance	534	740	949
Loans receivable, net				85,980	110,097
Allowance for loan losses: Individually evaluated for impairment
Allowance for loan losses: Collectively evaluated for impairment				534	740
Total Allowance for loan losses	740	740	949	534	740
Loans receivable, gross: Collectively evaluated for impairment				84,603	106,281
Commercial Portfolio Segment [Member]
Loans receivable, gross: Individually evaluated for impairment				231
Loans receivable, gross: Collectively evaluated for impairment				(60,746)	(59,752)
Loans receivable, gross				60,977	59,752
Balance	1,027	1,753	2,285
Charge-offs	(2,977)	0	(49)
Recoveries	66	49	6
Provision	2,624	(775)	(489)
Balance	740	1,027	1,753
Loans receivable, net				60,237	58,725
Allowance for loan losses: Individually evaluated for impairment				231
Allowance for loan losses: Collectively evaluated for impairment				509	1,027
Total Allowance for loan losses	1,027	1,027	1,753	740	1,027
Loans receivable, gross: Collectively evaluated for impairment				60,746	59,752
Consumer Portfolio Segment [Member]
Loans receivable, gross: Individually evaluated for impairment				542	550
Loans receivable, gross: Collectively evaluated for impairment				(100,907)	(46,971)
Loans receivable, gross				101,449	47,521
Balance	677	638	534
Charge-offs	(13)	(16)	(66)
Recoveries	2	11	4
Provision	(25)	44	166
Balance	641	677	638
Loans receivable, net				100,808	46,844
Allowance for loan losses: Individually evaluated for impairment					3
Allowance for loan losses: Collectively evaluated for impairment				641	674
Total Allowance for loan losses	677	677	638	641	677
Loans receivable, gross: Collectively evaluated for impairment				100,907	46,971
Construction Portfolio Segment [Member]
Loans receivable, gross: Individually evaluated for impairment
Loans receivable, gross: Collectively evaluated for impairment				(53,895)	(15,551)
Loans receivable, gross				53,895	15,551
Balance	486	49	260
Charge-offs			(260)
Recoveries			10
Provision	226	437	39
Balance	712	486	49
Loans receivable, net				53,183	15,065
Allowance for loan losses: Individually evaluated for impairment
Allowance for loan losses: Collectively evaluated for impairment				712	486
Total Allowance for loan losses	486	486	49	712	486
Loans receivable, gross: Collectively evaluated for impairment				53,895	15,551
Construction to Permanent Portfolio Segment [Member]
Loans receivable, gross: Individually evaluated for impairment
Loans receivable, gross: Collectively evaluated for impairment				(7,593)	(4,880)
Loans receivable, gross				7,593	4,880
Balance	123	179	25
Charge-offs
Recoveries	0	5
Provision	(54)	(61)	154
Balance	69	123	179
Loans receivable, net				7,524	4,757
Allowance for loan losses: Individually evaluated for impairment
Allowance for loan losses: Collectively evaluated for impairment				69	123
Total Allowance for loan losses	123	123	179	69	123
Loans receivable, gross: Collectively evaluated for impairment				7,593	4,880
Unallocated Financing Receivables [Member]
Loans receivable, gross: Individually evaluated for impairment
Loans receivable, gross: Collectively evaluated for impairment
Loans receivable, gross
Balance	219	152	197
Charge-offs	0	0
Recoveries	0	0
Provision	(93)	67	(45)
Balance	126	219	152
Loans receivable, net				(126)	(219)
Allowance for loan losses: Individually evaluated for impairment
Allowance for loan losses: Collectively evaluated for impairment				126	219
Total Allowance for loan losses	$ 219	$ 219	$ 152	126	219
Loans receivable, gross: Collectively evaluated for impairment

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=66008989&loc=SL6953423-111524

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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
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- Definition

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

+ References

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

+ References

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

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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
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-Name Accounting Standards Codification
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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
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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of expense related to estimated loss from loan and lease transactions.

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