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Note 7 - Loans and Related Allowance for Loan and Lease Losses - Additional Information on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Average recorded investment	$ 13,273	$ 13,302	$ 13,077	$ 13,737
Interest income recognized	137	15	512	182
Commercial And Industrial [Member]
Average recorded investment	2,633	864	1,962	1,218
Interest income recognized	69	4	210	9
Real Estate Construction Porfolio Segment [Member]
Average recorded investment	431	1,105	738	1,404
Interest income recognized		3	1	22
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Average recorded investment	2,988	3,389	3,149	3,660
Interest income recognized	19		69	36
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Average recorded investment	7,216	7,939	7,223	7,449
Interest income recognized	48	8	231	115
Consumer Portfolio Segment [Member]
Average recorded investment	5	5	5	6
Interest income recognized	$ 1		$ 1

X

- Definition

Average 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 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

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X

- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ 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 (c)(2)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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