Note 4 - Loans and Allowance for Loan Losses (Detail) - Allowance for Loan Losses Activity (USD $) In Thousands, unless otherwise specified	3 Months Ended			3 Months Ended
Mar. 31, 2013 Residential Portfolio Segment [Member]	Mar. 31, 2012 Residential Portfolio Segment [Member]	Mar. 31, 2013 Residential Portfolio Segment [Member]	Mar. 31, 2012 Residential Portfolio Segment [Member]	Mar. 31, 2013 Commercial Real Estate Portfolio Segment [Member]	Mar. 31, 2012 Commercial Real Estate Portfolio Segment [Member]	Mar. 31, 2013 Commercial Real Estate Portfolio Segment [Member]	Mar. 31, 2012 Commercial Real Estate Portfolio Segment [Member]	Mar. 31, 2012 Commercial and Industrial [Member]	Mar. 31, 2013 Commercial and Industrial [Member]	Dec. 31, 2012 Commercial and Industrial [Member]	Mar. 31, 2013 Commercial and Industrial [Member]	Mar. 31, 2012 Commercial and Industrial [Member]	Mar. 31, 2013 Consumer Portfolio Segment [Member]	Mar. 31, 2012 Consumer Portfolio Segment [Member]	Mar. 31, 2013 Consumer Portfolio Segment [Member]	Mar. 31, 2012 Consumer Portfolio Segment [Member]	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Allowance for loan losses:
Beginning balance	$ 1,329	$ 1,730			$ 3,946	$ 3,623			$ 636	$ 761	$ 783			$ 847	$ 1,355			$ 6,905	$ 7,344
Provision for loan losses		277	327			892	(478)		(88)			(33)			235	215			1,316	31
Loans charged off	(357)			(593)	(2)			(1,096)					(70)	(437)			(519)	(796)			(2,278)
Recoveries		77	15			4	278		145			11			239	228			465	532
Total ending allowance balance	$ 1,314			$ 1,491	$ 3,744			$ 3,423		$ 761	$ 783		$ 623	$ 853			$ 1,310	$ 6,672			$ 6,847

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A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

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- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(4)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

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- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

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- Definition

The sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 11

-Article 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 168, 169, 170

-IssueDate 2006-05-01

-Chapter 5

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.11)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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