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Note 7 - Loans and Related Allowance for Loan Losses - Impaired Loans by Class (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Recorded investment	$ 17,008	$ 12,430
Unpaid principal balance	16,873	12,405
Recorded investment, with no related allowance	7,224	5,405
Unpaid principal balance, with no related allowance	7,146	5,394
Recorded investment, with related allowance	9,784	7,025
Unpaid principal balance, with related allowance	9,727	7,011
Related allowance	1,732	527
Commercial Loans [Member]
Recorded investment, with related allowance	7,138
Unpaid principal balance, with related allowance	7,092
Related allowance	1,207
Commercial And Industrial [Member]
Recorded investment	3,084	1,190
Unpaid principal balance	3,073	1,186
Recorded investment, with no related allowance	1,539	319
Unpaid principal balance, with no related allowance	1,535	318
Recorded investment, with related allowance	1,545	871
Unpaid principal balance, with related allowance	1,538	868
Related allowance	335	90
Real Estate Construction Porfolio Segment [Member]
Recorded investment	541	913
Unpaid principal balance	507	909
Recorded investment, with no related allowance	541	913
Unpaid principal balance, with no related allowance	507	909
Recorded investment, with related allowance
Unpaid principal balance, with related allowance
Related allowance
Real Estate Construction Porfolio Segment [Member] | Residential Loan [Member]
Recorded investment, with related allowance	1,097
Unpaid principal balance, with related allowance	1,093
Related allowance	190
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Recorded investment	3,170	3,135
Unpaid principal balance	3,152	3,131
Recorded investment, with no related allowance	2,073	2,142
Unpaid principal balance, with no related allowance	2,059	2,140
Recorded investment, with related allowance		993
Unpaid principal balance, with related allowance		991
Related allowance	190	251
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Recorded investment	10,209	7,187
Unpaid principal balance	10,137	7,174
Recorded investment, with no related allowance	3,071	2,031
Unpaid principal balance, with no related allowance	3,045	2,027
Recorded investment, with related allowance		5,156
Unpaid principal balance, with related allowance		5,147
Related allowance	1,207	186
Consumer Portfolio Segment [Member]
Recorded investment	4	5
Unpaid principal balance	4	5
Recorded investment, with no related allowance
Unpaid principal balance, with no related allowance
Recorded investment, with related allowance		5
Unpaid principal balance, with related allowance		5
Related allowance

X

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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Period Type:	instant

X

- Definition

Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524

+ Details

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X

- Definition

Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

X

- Definition

Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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