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Note 6 - Retirement Plans (Tables)
9 Months Ended
Sep. 30, 2015
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
 
 
Three Months Ended
 
 
Nine Months Ended
 
 
 
September 30,
 
 
September 30,
 
 
 
2015
 
 
2014
 
 
2015
 
 
2014
 
Service cost
  $ -     $ 1,279     $ 3,116     $ 3,886  
Interest cost
    -       1,099       4,448       3,336  
Expected return on plan assets
    -       (1,123 )     (5,114 )     (3,410 )
Loss amortization
    -       263       1,740       799  
Net periodic benefit cost
  $ -     $ 1,518     $ 4,190     $ 4,611