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Note 3 - Loans Receivable and Allowance for Loan Losses - Loan Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Loans receivable, gross	$ 710,118		$ 581,657
Allowance for loan losses	(6,222)	$ (5,944)	(4,675)	$ (7,328)	$ (7,209)	$ (5,242)
Loans receivable, net	703,896		576,982
Commercial Real Estate Portfolio Segment [Member]
Loans receivable, gross	296,625		271,229
Allowance for loan losses	(2,172)	(2,218)	(1,853)	(1,804)	(2,295)	(1,970)
Residential Portfolio Segment [Member]
Loans receivable, gross	150,664		86,514
Allowance for loan losses	(1,045)	(1,041)	(534)	(1,412)	(647)	(740)
Commercial Portfolio Segment [Member]
Loans receivable, gross	117,673		60,977
Allowance for loan losses	(1,873)	(1,453)	(740)	(3,702)	(3,400)	(1,027)
Consumer Portfolio Segment [Member]
Loans receivable, gross	90,973		101,449
Allowance for loan losses	(258)	(593)	(641)	(200)	(531)	(677)
Construction Portfolio Segment [Member]
Loans receivable, gross	48,328		53,895
Allowance for loan losses	(783)	(490)	(712)	(61)	(169)	(486)
Construction to Permanent Portfolio Segment [Member]
Loans receivable, gross	5,855		7,593
Allowance for loan losses	$ (46)	$ (73)	$ (69)	$ (127)	$ (145)	$ (123)

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

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
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544

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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 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. Includes loans held for sale. 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 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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