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Note 15 - Stock Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
    Stock Options
Outstanding		   Stock Awards
Outstanding		   Stock Units
Outstanding
    Number
of Shares
(000)		   Weighted
Average
Exercise
Price		   Number
of Shares
(000)		   Weighted
Average
Exercise
Price		   Number
of Shares
(000)		   Weighted
Average
Exercise
Price
                         
Balance, January 1, 2017    
473
     $
42.85
      
139
     $
40.96
      
113
     $
45.40
  
Granted    
--
      
--
      
--
      
--
      
185
      
58.18
  
Stock Options Exercised    
(39
 )    
32.16
      
--
      
--
      
--
      
--
  
Stock Awards/Units Vested    
--
      
--
      
(34
 )    
36.45
      
(124
 )    
52.71
  
Forfeited/Expired    
(3
 )    
44.68
      
(12
 )    
43.83
      
(13
 )    
51.72
  
                                                 
Balance, September 30, 2017    
431
     $
43.82
      
93
     $
42.21
      
161
     $
53.97
  
                                                 
Exercisable, September 30, 2017    
325
     $
43.23
      
 
      
 
      
 
      
 
  
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
    
Weighted
Average
Remaining
Contractual
Life (Years)
    
Weighted
Average
Exercise
Price
    
Number
of Shares
    
Weighted
Average
Exercise
Price
  
$17.55
-
$21.13
    
3,950
      
2.76
    
$
19.38
      
3,950
    
$
19.38
  
21.29
-
21.29
    
3,700
      
5.30
      
21.29
      
2,500
      
21.29
  
21.51
-
21.51
    
1,250
      
2.30
      
21.51
      
1,250
      
21.51
  
30.31
-
30.31
    
22,180
      
0.63
      
30.31
      
22,180
      
30.31
  
40.57
-
40.57
    
40,490
      
7.25
      
40.57
      
40,490
      
40.57
  
40.72
-
40.72
    
1,500
      
7.13
      
40.72
      
600
      
40.72
  
44.40
-
44.40
    
49,870
      
7.25
      
44.40
      
37,144
      
44.40
  
45.50
-
45.50
    
246,485
      
7.62
      
45.50
      
193,025
      
45.50
  
47.02
-
47.02
    
58,090
      
7.79
      
47.02
      
20,838
      
47.02
  
48.13
-
48.13
    
3,305
      
7.96
      
48.13
      
2,645
      
48.13
  
$17.55
-
$48.13
    
430,820
      
7.12
    
$
43.82
      
324,622
    
$
43.23
  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    Nine Months Ended
September 30, 2016
     
Expected dividend yield    
1.96
 %
Expected stock price volatility    
27.34
 %
Risk-free interest rate    
2.01
 %
Expected life of options (in years)    
7