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Note 3 - Loans Receivable and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Dec. 31, 2016
Balance	$ 5,697	$ 5,247	$ 4,675	$ 5,242
Charge-offs	(13)	(1)	(13)	(6)
Recoveries	0	4	2,771	14
Provisions (credits)	260	1,959	(1,489)	1,959
Balance	5,944	7,209	5,944	7,209
Allowance for loan losses: Collectively evaluated for impairment					$ 5,713	$ 4,444
Total allowance for loan losses	5,944	5,247	5,944	7,209	5,944	4,675
Loans receivable, gross: Individually evaluated for impairment					8,856	8,951
Loans receivable, gross: Collectively evaluated for impairment					670,232	572,706
Total loans receivable, gross					679,088	581,657
Allowance for loan losses: Individually evaluated for impairment					231	231
Commercial Real Estate Portfolio Segment [Member]
Balance	2,198	1,943	1,853	1,970
Charge-offs	0	0	0	0
Recoveries	0	0	2	0
Provisions (credits)	20	352	363	325
Balance	2,218	2,295	2,218	2,295
Allowance for loan losses: Collectively evaluated for impairment					2,218	1,853
Total allowance for loan losses	2,198	1,943	2,218	2,295	2,218	1,853
Loans receivable, gross: Individually evaluated for impairment					6,142	6,267
Loans receivable, gross: Collectively evaluated for impairment					273,917	264,962
Total loans receivable, gross					280,059	271,229
Allowance for loan losses: Individually evaluated for impairment					0	0
Residential Portfolio Segment [Member]
Balance	1,073	624	534	740
Charge-offs	0	0	0	(4)
Recoveries	0	1	0	1
Provisions (credits)	(32)	22	507	(90)
Balance	1,041	647	1,041	647
Allowance for loan losses: Collectively evaluated for impairment					1,041	534
Total allowance for loan losses	1,073	624	1,041	647	1,041	534
Loans receivable, gross: Individually evaluated for impairment					1,905	1,911
Loans receivable, gross: Collectively evaluated for impairment					150,523	84,603
Total loans receivable, gross					152,428	86,514
Allowance for loan losses: Individually evaluated for impairment					0	0
Commercial Portfolio Segment [Member]
Balance	1,049	1,083	740	1,027
Charge-offs	0	0	0	0
Recoveries	0	3	2,769	12
Provisions (credits)	404	2,314	(2,056)	2,361
Balance	1,453	3,400	1,453	3,400
Allowance for loan losses: Collectively evaluated for impairment					1,222	509
Total allowance for loan losses	1,049	1,083	1,453	3,400	1,453	740
Loans receivable, gross: Individually evaluated for impairment					269	231
Loans receivable, gross: Collectively evaluated for impairment					94,615	60,746
Total loans receivable, gross					94,884	60,977
Allowance for loan losses: Individually evaluated for impairment					231	231
Consumer Portfolio Segment [Member]
Balance	583	609	641	677
Charge-offs	(13)	(1)	(13)	(2)
Recoveries	0		0	1
Provisions (credits)	23	(77)	(35)	(145)
Balance	593	531	593	531
Allowance for loan losses: Collectively evaluated for impairment					593	641
Total allowance for loan losses	583	609	593	531	593	641
Loans receivable, gross: Individually evaluated for impairment					540	542
Loans receivable, gross: Collectively evaluated for impairment					94,290	100,907
Total loans receivable, gross					94,830	101,449
Allowance for loan losses: Individually evaluated for impairment					0	0
Construction Portfolio Segment [Member]
Balance	591	650	712	486
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provisions (credits)	(101)	(481)	(222)	(317)
Balance	490	169	490	169
Allowance for loan losses: Collectively evaluated for impairment					490	712
Total allowance for loan losses	591	650	490	169	490	712
Loans receivable, gross: Individually evaluated for impairment					0	0
Loans receivable, gross: Collectively evaluated for impairment					49,222	53,895
Total loans receivable, gross					49,222	53,895
Allowance for loan losses: Individually evaluated for impairment					0	0
Construction to Permanent Portfolio Segment [Member]
Balance	77	121	69	123
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provisions (credits)	(4)	24	4	22
Balance	73	145	73	145
Allowance for loan losses: Collectively evaluated for impairment					73	69
Total allowance for loan losses	77	121	73	145	73	69
Loans receivable, gross: Individually evaluated for impairment					0	0
Loans receivable, gross: Collectively evaluated for impairment					7,665	7,593
Total loans receivable, gross					7,665	7,593
Allowance for loan losses: Individually evaluated for impairment					0	0
Unallocated Financing Receivables [Member]
Balance	126	217	126	219
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provisions (credits)	(50)	(195)	(50)	(197)
Balance	76	22	76	22
Allowance for loan losses: Collectively evaluated for impairment					76	126
Total allowance for loan losses	$ 126	$ 217	$ 76	$ 22	76	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
Allowance for loan losses: Individually evaluated for impairment					$ 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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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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-Publisher FASB
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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
-Paragraph 2
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Amount of expense related to estimated loss from loan and lease transactions.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 225
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