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Note 4 - Loans And Related Allowance For Loan Losses (Detail) - Additional Information on Impaired Loans (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commercial and Industrial [Member]
Total:
Impaired loans, average recorded investment	$ 2,776	$ 1,637	$ 3,149
Impaired loans, interest income recognized	348	58	13
Real Estate Construction [Member]
Total:
Impaired loans, average recorded investment	2,798	4,521	618
Impaired loans, interest income recognized	156	216	1
Residential Real Estate Mortgage [Member]
Total:
Impaired loans, average recorded investment	4,263	3,188	594
Impaired loans, interest income recognized	338	157
Commercial Real Estate Mortgage [Member]
Total:
Impaired loans, average recorded investment	4,717	5,083	3,320
Impaired loans, interest income recognized	543	97	69
Consumer Installment [Member]
Total:
Impaired loans, average recorded investment	27	24
Impaired loans, interest income recognized	$ 3	$ 2

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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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