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Note 12 - Income Taxes (Detail) - Tax Rate Reconciliation (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Provision at statutory rate (in Dollars)                 $ 2,700 $ 1,606 $ 827
Provision at statutory rate                 34.00% 34.00% 34.00%
Tax-free income (in Dollars)                 (1,095) (1,071) (993)
Tax-free income                 (13.80%) (22.70%) (40.90%)
Nondeductible interest expense (in Dollars)                 48 61 76
Nondeductible interest expense                 0.60% 1.30% 3.10%
Other (in Dollars)                 9   2
Other                 0.10% 0.00% 0.20%
Actual tax expense and effective rate (in Dollars) $ 270 $ 494 $ 463 $ 435 $ 277 $ 175 $ (1) $ 145 $ 1,662 $ 596 $ (88)
Actual tax expense and effective rate                 20.90% 12.60% (3.60%)