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Note 9 - Pension and Other Postretirement Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
    Three months ended
    March 31,
(In thousands)   2018   2017
         
Employee Pension Plan:                
Interest cost   $
195
    $
216
 
Amortization of unrecognized loss    
155
     
174
 
Expected return on plan assets    
(363
)    
(348
)
Net employee pension ( benefit) expense   $
(13
)   $
42
 
                 
Outside Director Pension Plan:                
Service cost   $
11
    $
10
 
Interest cost    
20
     
23
 
Amortization of unrecognized gain    
(23
)    
(23
)
Amortization of past service liability    
3
     
10
 
Net outside director pension expense   $
11
    $
20
 
                 
Other Postretirement Benefit Plans:                
Service cost   $
88
    $
79
 
Interest cost    
77
     
76
 
Amortization of unrecognized loss    
-
     
-
 
Amortization of past service credit    
(13
)    
(21
)
Net other postretirement expense   $
152
    $
134