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Note 8 - Shareholders' Equity (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
    Options Outstanding   Options Exercisable
    At December 31, 2018   For the Year Ended December 31, 2018   At December 31, 2018   For the Year Ended December 31, 2018
Range of Exercise Price   Number Outstanding   Aggregate Intrinsic Value   Weighted Average Remaining Contractual Life   Weighted Average Exercise Price   Number Exercisable   Aggregate Intrinsic Value   Weighted Average Remaining Contractual Life   Weighted Average Exercise Price
    (In thousands)   (Years)       (In thousands)   (Years)    
$40
-
45
   
176
    $
2,309
     
6.6
    $
43
     
87
    $
1,122
     
6.1
    $
43
 
45
-
50
   
11
     
106
     
3.1
     
46
     
11
     
106
     
3.1
     
46
 
50
-
55
   
286
     
1,297
     
0.7
     
51
     
286
     
1,297
     
0.7
     
51
 
55
-
60
   
229
     
-
     
7.7
     
57
     
73
     
-
     
6.9
     
57
 
60
-
65
   
244
     
-
     
9.1
     
62
     
-
     
 N/A 
     
 N/A 
     
 N/A 
 
$40
-
65
   
946
    $
3,712
     
5.7
     
54
     
457
    $
2,525
     
2.8
     
50
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    For the Years Ended December 31,
    2018   2017   2016
Expected volatility
(1)
   
20
%    
20
%    
22
%
Expected life in years
(2)
   
4.8
     
4.8
     
4.8
 
Risk-free interest rate
(3)
   
2.50
%    
1.97
%    
1.41
%
Expected dividend yield    
2.65
%    
3.28
%    
4.49
%
Fair value per award   $
9.98
    $
8.27
    $
5.97
 
Share-based Compensation, Stock Options, Activity [Table Text Block]
    Shares   Weighted Average Exercise Price   Weighted Average Remaining Contractual Term
    (In thousands)       (Years)
Outstanding at January 1, 2018    
1,030
    $
49.44
     
 
 
Granted    
249
     
62.16
     
 
 
Exercised    
(292
)    
45.76
     
 
 
Forfeited or expired    
(41
)    
52.54
     
 
 
Outstanding at December 31, 2018    
946
    $
53.78
     
5.7
 
Exercisable at December 31, 2018    
457
    $
50.38
     
2.8
 
Schedule of Nonvested Share Activity [Table Text Block]
    Shares   Weighted Average Grant Date Fair Value
    (In thousands)    
Nonvested at January 1, 2018    
561
    $
6.98
 
Granted    
249
     
9.98
 
Vested    
(280
)    
6.54
 
Forfeited    
(41
)    
7.66
 
Nonvested at December 31, 2018    
489
     
8.71
 
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
    2018   2017
    (In thousands)
Outstanding at January 1,    
49
     
48
 
Granted    
11
     
14
 
Issued upon vesting    
(19
)    
(13
)
Forfeited    
(2
)    
-
 
Outstanding at December 31,    
39
     
49