Note 4 - Loans and Allowance for Loan Losses (Detail) - Post-Modification Balances of TDR Loan Modifications (Performing to Modified Terms [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Performing to Modified Terms [Member]
Residential real estate
Pre-Modification Recorded Investment	$ 249
Post-Modification Recorded Investment	$ 249

Amount of investment in financing receivables (after modification) modified by troubled debt restructurings.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant