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Note 12 - Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   
Three Months Ended
    
Nine Months Ended
  
   
September 30,
    
September 30,
  
   
2018
   
2017
   
2018
   
2017
 
Interest cost
   $
143
     $
153
     $
425
     $
465
  
Expected return on plan assets
    
(198
 )    
(184
 )    
(594
 )    
(554
 )
Amortization of loss
    
42
      
184
      
338
      
550
  
Net periodic pension expense
   $
(13
 )   $
153
     $
169
     $
461