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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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Commercial And Industrial [Member]
Average Recorded Investment	$ 864	$ 1,480	$ 1,218	$ 1,354
Interest Income Recognized	4	21	9	73
Real Estate Construction Porfolio Segment [Member]
Average Recorded Investment	1,105	2,347	1,404	2,614
Interest Income Recognized	3	28	22	94
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Average Recorded Investment	3,389	4,195	3,660	4,514
Interest Income Recognized		43	36	128
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Average Recorded Investment	7,939	5,476	7,449	4,871
Interest Income Recognized	8	71	115	200
Consumer Portfolio Segment [Member]
Average Recorded Investment	5	6	6	6
Interest Income Recognized
Average Recorded Investment	13,302	13,504	13,737	13,359
Interest Income Recognized	$ 15	$ 163	$ 182	$ 495

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=66008989&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=66008989&loc=d3e5258-111524

+ Details

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

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=66008989&loc=d3e5212-111524

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- Details

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- Details

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