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Note 10 - Derivative Financial Instruments (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Sep. 30, 2009
Notional Amount of Interest Rate Derivatives $ 17.5   $ 15.0 $ 17.5 $ 17.5
Junior Subordinated Notes         36.1
Derivative, Fixed Interest Rate       5.38%  
Derivative, Variable Interest Rate       1.55%  
Interest Rate Derivative Liabilities, at Fair Value 1.9 2.0      
Derivative, Cap Interest Rate     2.00%    
Derivative, Collateral, Right to Reclaim Cash $ 2.3