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Note 3 - Loans Receivable and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016
Balance	$ 5,944	$ 7,209	$ 4,675	$ 5,242
Charge-offs	(275)	(238)	(288)	(244)
Recoveries	8	2	2,779	16
Provisions (credits)	545	355	(944)	2,314
Balance	6,222	7,328	6,222	7,328
Allowance for loan losses: Individually evaluated for impairment					$ 285	$ 231
Allowance for loan losses: Collectively evaluated for impairment					5,937	4,444
Total allowance for loan losses	6,222	7,209	6,222	7,328	6,222	4,675
Loans receivable, gross: Individually evaluated for impairment					8,985	8,951
Loans receivable, gross: Collectively evaluated for impairment					701,133	572,706
Total loans receivable, gross					710,118	581,657
Commercial Real Estate Portfolio Segment [Member]
Balance	2,218	2,295	1,853	1,970
Charge-offs	0	0	0	0
Recoveries	6	0	8	0
Provisions (credits)	(52)	(491)	311	(166)
Balance	2,172	1,804	2,172	1,804
Allowance for loan losses: Individually evaluated for impairment					0	0
Allowance for loan losses: Collectively evaluated for impairment					2,172	1,853
Total allowance for loan losses	2,218	2,295	2,172	1,804	2,172	1,853
Loans receivable, gross: Individually evaluated for impairment					6,081	6,267
Loans receivable, gross: Collectively evaluated for impairment					290,544	264,962
Total loans receivable, gross					296,625	271,229
Residential Portfolio Segment [Member]
Balance	1,041	647	534	740
Charge-offs	0	(186)	0	(190)
Recoveries	0	2	0	3
Provisions (credits)	4	949	511	859
Balance	1,045	1,412	1,045	1,412
Allowance for loan losses: Individually evaluated for impairment					0	0
Allowance for loan losses: Collectively evaluated for impairment					1,045	534
Total allowance for loan losses	1,041	647	1,045	1,412	1,045	534
Loans receivable, gross: Individually evaluated for impairment					1,904	1,911
Loans receivable, gross: Collectively evaluated for impairment					148,760	84,603
Total loans receivable, gross					150,664	86,514
Commercial Portfolio Segment [Member]
Balance	1,453	3,400	740	1,027
Charge-offs	(265)	(50)	(265)	(50)
Recoveries	0	0	2,769	12
Provisions (credits)	685	352	(1,371)	2,713
Balance	1,873	3,702	1,873	3,702
Allowance for loan losses: Individually evaluated for impairment					285	231
Allowance for loan losses: Collectively evaluated for impairment					1,588	509
Total allowance for loan losses	1,453	3,400	1,873	3,702	1,873	740
Loans receivable, gross: Individually evaluated for impairment					285	231
Loans receivable, gross: Collectively evaluated for impairment					117,388	60,746
Total loans receivable, gross					117,673	60,977
Consumer Portfolio Segment [Member]
Balance	593	531	641	677
Charge-offs	(10)	(2)	(23)	(4)
Recoveries	2	0	2	1
Provisions (credits)	(327)	(329)	(362)	(474)
Balance	258	200	258	200
Allowance for loan losses: Individually evaluated for impairment					0	0
Allowance for loan losses: Collectively evaluated for impairment					258	641
Total allowance for loan losses	593	531	258	200	258	641
Loans receivable, gross: Individually evaluated for impairment					715	542
Loans receivable, gross: Collectively evaluated for impairment					90,258	100,907
Total loans receivable, gross					90,973	101,449
Construction Portfolio Segment [Member]
Balance	490	169	712	486
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provisions (credits)	293	(108)	71	(425)
Balance	783	61	783	61
Allowance for loan losses: Individually evaluated for impairment					0	0
Allowance for loan losses: Collectively evaluated for impairment					783	712
Total allowance for loan losses	490	169	783	61	783	712
Loans receivable, gross: Individually evaluated for impairment					0	0
Loans receivable, gross: Collectively evaluated for impairment					48,328	53,895
Total loans receivable, gross					48,328	53,895
Construction to Permanent Portfolio Segment [Member]
Balance	73	145	69	123
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provisions (credits)	(27)	(18)	(23)	4
Balance	46	127	46	127
Allowance for loan losses: Individually evaluated for impairment					0	0
Allowance for loan losses: Collectively evaluated for impairment					46	69
Total allowance for loan losses	73	145	46	127	46	69
Loans receivable, gross: Individually evaluated for impairment					0	0
Loans receivable, gross: Collectively evaluated for impairment					5,855	7,593
Total loans receivable, gross					5,855	7,593
Unallocated Financing Receivables [Member]
Balance	76	22	126	219
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provisions (credits)	(31)	0	(81)	(197)
Balance	45	22	45	22
Allowance for loan losses: Individually evaluated for impairment					0	0
Allowance for loan losses: Collectively evaluated for impairment					45	126
Total allowance for loan losses	$ 76	$ 22	$ 45	$ 22	45	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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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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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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-Topic 310
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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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

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-SubTopic 225
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