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Note 9 - Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
    Three months ended   Six months ended
    June 30,   June 30,
(In thousands)   2017   2016   2017   2016
                 
Employee Pension Plan:                                
Interest cost   $
216
     $
226
     $
432
     $
452
  
Amortization of unrecognized loss    
174
      
201
      
348
      
402
  
Expected return on plan assets    
(348
 )    
(348
 )    
(696
 )    
(696
 )
Net employee pension expense   $
42
     $
79
     $
84
     $
158
  
                                 
Outside Director Pension Plan:                                
Service cost   $
10
     $
11
     $
20
     $
22
  
Interest cost    
23
      
24
      
46
      
48
  
Amortization of unrecognized gain    
(23
 )    
(21
 )    
(46
 )    
(42
 )
Amortization of past service liability    
10
      
10
      
20
      
20
  
Net outside director pension expense   $
20
     $
24
     $
40
     $
48
  
                                 
Other Postretirement Benefit Plans:                                
Service cost   $
79
     $
90
     $
158
     $
180
  
Interest cost    
76
      
80
      
152
      
160
  
Amortization of unrecognized loss    
-
      
12
      
-
      
24
  
Amortization of past service credit    
(21
 )    
(22
 )    
(42
 )    
(43
 )
Net other postretirement expense   $
134
     $
160
     $
268
     $
321