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Note 12 - Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   
Three Months Ended
    
Six Months Ended
  
   
June 30,
    
June 30,
  
   
2018
   
2017
   
2018
   
2017
 
Interest cost
   $
141
     $
156
     $
282
     $
312
  
Expected return on plan assets
    
(198
 )    
(185
 )    
(396
 )    
(370
 )
Amortization of loss
    
148
      
183
      
296
      
366
  
Net periodic pension expense
   $
91
     $
154
     $
182
     $
308