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Note 4 - Fair Value Measurements (Detail) - Additional Quantitative Information About Assets measured at fair value (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Appraisal of Collateral - Appraisal Adjustments [Member]
Minimum [Member]
Sep. 30, 2012
Appraisal of Collateral - Appraisal Adjustments [Member]
Maximum [Member]
Sep. 30, 2012
Appraisal of Collateral - Appraisal Adjustments [Member]
Sep. 30, 2012
Appraisal of Collateral Liquidation Expenses [Member]
Minimum [Member]
Sep. 30, 2012
Appraisal of Collateral Liquidation Expenses [Member]
Maximum [Member]
Sep. 30, 2012
Appraisal of Collateral [Member]
Estimate (in Dollars) $ 17,233 $ 18,237     $ 14,258 [1],[2]      
Range     0.00% (75.00%)   0.00% (45.80%)  
Other real estate owned (in Dollars)               $ 2,332 [1],[3]
[1] Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various level 3 inputs which are not identifiable.
[2] Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range and weighted average of liquidation expenses and other appraisal adjustments are presented as a percent of the appraisal.
[3] Includes qualitative adjustments by management and estimated liquidation expenses.