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Note 11 - Share Based Compensation And Employee Benefit Plans (Detail) - Non-vested Restricted Stock Awards and RSU's (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Granted (in Dollars per share) $ 21.98 $ 18.93 $ 13.08
Restricted Stock [Member]
     
Stock Awards and Units, Shares 232,114 203,887  
Weighted Average Remaining Contractual Life (in Years) 8 years 226 days    
Aggregate Intrinsic Value (in Dollars) $ 4,797,796    
Weighted Average Grant Date Fair Value (in Dollars per share) $ 20.50 $ 14.89  
Expected to vest after December 31, 2012 227,066    
Expected to vest after December 31, 2012 8 years 226 days    
Expected to vest after December 31, 2012 (in Dollars) $ 4,693,454    
Granted 161,239    
Granted (in Dollars per share) $ 21.98    
Vested (133,012)    
Vested (in Dollars per share) $ 13.70