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Note 2 - Stock-Based Compensation (Detail) - 2004 Plan Restricted Stock Summary (USD $)
1 Months Ended 3 Months Ended 3 Months Ended
Dec. 31, 2012
Mar. 31, 2013
Mar. 31, 2013
Restricted Stock Units (RSUs) [Member]
Nov. 30, 2012
Restricted Stock Units (RSUs) [Member]
Mar. 31, 2013
Performance Shares [Member]
Nov. 30, 2012
Performance Shares [Member]
Stock Units 1,629,748     1,098,563   531,185
Weighted Average Grant Date Fair Value Per Share (in Dollars per share) $ 17.46     $ 16.96   $ 18.49
Weighted Average Remaining Recognition Period 2 years 65 days 2 years 113 days        
Awards granted   550,928 239,388   311,540  
Awards granted (in Dollars per share)   $ 24.13 $ 23.84   $ 24.35  
Performance awards adjustment (1)   49,972 [1]    [1]   49,972 [1]  
Performance awards adjustment (1) (in Dollars per share)   $ 17.55 [1]    [1]   $ 17.55 [1]  
Awards released   (367,487) (161,078)   (206,409)  
Awards released (in Dollars per share)   $ 17.85 $ 16.51   $ 18.90  
Awards forfeited   (92,430) (65,374)   (27,056)  
Awards forfeited (in Dollars per share)   $ 16.93 $ 16.52   $ 17.91  
Stock Units   1,770,731 1,111,499 1,098,563 659,232 531,185
Weighted Average Grant Date Fair Value Per Share (in Dollars per share)   $ 19.48 $ 18.53 $ 16.96 $ 21.09 $ 18.49
Weighted Average Remaining Recognition Period 2 years 65 days 2 years 113 days        
[1] The performance awards adjustment reflects those PSUs for which the achievement of the pre-determined performance goals will be different than the targets based on management's probability assessment as of March 31, 2013.