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Note 6 - Retirement Plans (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   
Three Months Ended March 31,
 
   
2018
   
2017
 
                 
Interest cost
  $
1,106
    $
807
 
Expected return on plan assets
   
(1,536
)    
(976
)
Loss amortization
   
169
     
84
 
Net periodic benefit cost
  $
(261
)   $
(85
)