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Note 6 - Loans And Related Allowance For Loan Losses (Detail) - Additional Information on Impaired Loans (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Commercial and Industrial [Member]
Total:
Average Recorded Investment	$ 2,535	$ 3,295	$ 2,170	$ 3,266
Interest Income Recognized	139	11	170	93
Real Estate Construction [Member]
Total:
Average Recorded Investment	2,305	630	2,400	624
Interest Income Recognized		15	113	15
Residential Real Estate Mortgage [Member]
Total:
Average Recorded Investment	3,622	997	3,764	793
Interest Income Recognized	85	23	169	68
Commercial Real Estate Mortgage [Member]
Total:
Average Recorded Investment	3,597	4,899	3,985	4,081
Interest Income Recognized	200	86	324	188
Consumer Installment [Member]
Total:
Average Recorded Investment	13	25	27	13
Interest Income Recognized	$ 1		$ 2	$ 4

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- 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=7512638&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=7512638&loc=d3e5258-111524

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- 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=7512638&loc=d3e5212-111524

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