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Note 7 - Loans and Related Allowance for Loan Losses - Primary Segments of the Loan Portfolio (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Individually evaluated for impairment	$ 12,279	$ 12,430
Collectively evaluated for impairment	824,879	596,710
Total loans	837,158	609,140
Individually evaluated for impairment	529	527
Collectively evaluated for impairment	6,191	6,071
Total ending allowance balance	6,720	6,598	$ 6,357	$ 6,385
Commercial And Industrial [Member]
Individually evaluated for impairment	1,553	1,190
Collectively evaluated for impairment	90,224	59,440
Total loans	91,777	60,630
Individually evaluated for impairment	237	90
Collectively evaluated for impairment	379	358
Total ending allowance balance	616	448	583	867
Real Estate Construction Porfolio Segment [Member]
Individually evaluated for impairment	706	913
Collectively evaluated for impairment	28,532	22,796
Total loans	29,238	23,709
Individually evaluated for impairment
Collectively evaluated for impairment	186	172
Total ending allowance balance	186	172	247	276
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Individually evaluated for impairment	3,049	3,135
Collectively evaluated for impairment	297,459	267,695
Total loans	300,508	270,830
Individually evaluated for impairment	104	251
Collectively evaluated for impairment	2,419	2,567
Total ending allowance balance	2,523	2,818	2,716	3,139
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Individually evaluated for impairment	6,967	7,187
Collectively evaluated for impairment	388,135	242,303
Total loans	395,102	249,490
Individually evaluated for impairment	188	186
Collectively evaluated for impairment	3,190	2,949
Total ending allowance balance	3,378	3,135	2,783	2,078
Consumer Portfolio Segment [Member]
Individually evaluated for impairment	4	5
Collectively evaluated for impairment	20,529	4,476
Total loans	20,533	4,481
Individually evaluated for impairment
Collectively evaluated for impairment	17	25
Total ending allowance balance	$ 17	$ 25	$ 28	$ 25

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
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-Section 50
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-Publisher FASB
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-Topic 310
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-Publisher FASB
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-Topic 310
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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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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))
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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.

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