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Note 9 - Pension and Other Postretirement Benefit Plans (Tables) (Retirement Plan [Member])
3 Months Ended
Mar. 31, 2015
Retirement Plan [Member]
 
Note 9 - Pension and Other Postretirement Benefit Plans (Tables) [Line Items]  
Schedule of Net Benefit Costs [Table Text Block]
   
Three months ended
March 31,
 
(In thousands)
 
2015
   
2014
 
Employee Pension Plan:
           
Interest cost
  $ 221     $ 223  
Amortization of unrecognized loss
    291       190  
Expected return on plan assets
    (350 )     (336 )
Net employee pension expense
  $ 162     $ 77  
Outside Director Pension Plan:
               
Service cost
  $ 11     $ 13  
Interest cost
    24       29  
Amortization of unrecognized gain
    (14 )     (15 )
Amortization of past service liability
    10       10  
Net outside director pension expense
  $ 31     $ 37  
Other Postretirement Benefit Plans:
               
Service cost
  $ 95     $ 90  
Interest cost
    75       63  
Amortization of unrecognized loss
    30       -  
Amortization of past service liability
    (21 )     (21 )
Net other postretirement expense
  $ 179     $ 132