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Note 13 - Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
    Stock Options
Outstanding		   Non-Vested Stock
Awards Outstanding
    Number
of Shares
(000)		   Weighted
Average
Exercise
Price		   Number
of Shares
(000)		   Weighted
Average
Grant-Date
Fair-Value
                 
Balance, December 31, 2012     218     $ 26.77       134     $ 25.89  
Granted     --       --       75       26.89  
Stock Options Exercised     (24 )     24.88       --       --  
Stock Awards Vested     --       --       (63 )     26.82  
Forfeited/Expired     (9 )     26.16       (1 )     26.54  
                                 
Balance, December 31, 2013     185       27.04       145       26.00  
Granted     --       --       134       37.51  
Stock Options Exercised     (65 )     25.86       --       --  
Stock Awards Vested     --       --       (51 )     30.62  
Forfeited/Expired     --       --       (1 )     26.54  
                                 
Balance, December 31, 2014     120       27.72       227       31.88  
Granted     375       44.69       95       43.45  
Stock Options Exercised     (71 )     22.57       --       --  
Stock Options from Acquisitions     66       20.43       --       --  
Stock Awards Vested     --       --       (131 )     34.77  
Forfeited/Expired     (5 )     24.49       (8 )     35.36  
                                 
Balance, December 31, 2015     485     $ 40.59       183     $ 35.65  
                                 
Exercisable, December 31, 2015     238     $ 36.90                  
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
        Options Outstanding   Options Exercisable
Range of Exercise Prices   Number
of Shares
(000)		   Weighted
Average
Remaining
Contractual
Life (Years)		   Weighted
Average
Exercise
Price		   Number
of Shares
(000)		   Weighted
Average
Exercise
Price
                         
$15.55 - $21.29     24       4.86     $ 19.41       13     $ 18.53  
21.51 - 21.51     2       4.05       21.51       2       21.51  
26.19 - 26.19     25       0.38       26.19       25       26.19  
28.42 - 28.42     27       1.36       28.42       27       28.42  
30.31 - 30.31     30       2.27       30.31       30       30.31  
40.57 - 40.57     49       7.63       40.57       49       40.57  
40.72 - 40.72     2       8.88       40.72       --       40.72  
44.40 - 44.40     65       7.55       44.40       14       44.40  
45.50 - 45.50     258       9.05       45.50       77       45.50  
48.13 - 48.13     3       9.71       48.13       1       48.13  
$15.55 - $48.13     485       7.19     $ 40.59       238     $ 36.90  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block]
    Year Ended December 31, 2015
     
Expected dividend yield     2.06 %
Expected stock price volatility     16.96 %
Risk-free interest rate     2.17 %
Expected life of options (years)     10