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Note 7 - Loans and Related Allowance for Loan Losses - Primary Segments of the Loan Portfolio (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Individually evaluated for impairment	$ 17,008		$ 12,430
Collectively evaluated for impairment	850,856		596,710
Total loans	867,864		609,140
Collectively evaluated for impairment	4,873		6,071
Total ending allowance balance	6,605	$ 6,720	6,598	$ 6,366	$ 6,357	$ 6,385
Individually evaluated for impairment	1,732		527
Commercial And Industrial [Member]
Individually evaluated for impairment	3,084		1,190
Collectively evaluated for impairment	94,076		59,440
Total loans	97,160		60,630
Collectively evaluated for impairment	278		358
Total ending allowance balance	613	616	448	484	583	867
Individually evaluated for impairment	335		90
Real Estate Construction Porfolio Segment [Member]
Individually evaluated for impairment	541		913
Collectively evaluated for impairment	35,030		22,796
Total loans	35,571		23,709
Collectively evaluated for impairment	202		172
Total ending allowance balance	202	186	172	159	247	276
Individually evaluated for impairment
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Individually evaluated for impairment	3,170		3,135
Collectively evaluated for impairment	305,349		267,695
Total loans	308,519		270,830
Collectively evaluated for impairment	1,577		2,567
Total ending allowance balance	1,767	2,523	2,818	2,788	2,716	3,139
Individually evaluated for impairment	190		251
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Individually evaluated for impairment	10,209		7,187
Collectively evaluated for impairment	396,461		242,303
Total loans	406,670		249,490
Collectively evaluated for impairment	2,805		2,949
Total ending allowance balance	4,012	3,378	3,135	2,909	2,783	2,078
Individually evaluated for impairment	1,207		186
Consumer Portfolio Segment [Member]
Individually evaluated for impairment	4		5
Collectively evaluated for impairment	19,940		4,476
Total loans	19,944		4,481
Collectively evaluated for impairment	11		25
Total ending allowance balance	11	$ 17	25	$ 26	$ 28	$ 25
Individually evaluated for impairment

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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- Definition

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+ 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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+ 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
-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
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-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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Amount before allowance and after 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.

+ 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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