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Note 13 - Fair Value of Financial Instruments (Detail) - Assets and Liabilities Measured at Fair Value on a Recurring Basis (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
US Government-sponsored Enterprises Debt Securities [Member] |  |
Assets Measured on Recurring Basis | $ 1,012 | $ 2,559
Agency Mortgage-Backed Securitites, Residential (Member) |  |
Assets Measured on Recurring Basis | 93,953 | 77,598
US Treasury Securities [Member] |  |
Assets Measured on Recurring Basis |  | $ 5,513

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant