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Note 15 - Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   
Three Months Ended
  
   
March 31,
    
April 1,
  
   
2019
    
2018
  
   
(Unaudited)
  
Service cost
   $
1
     $
2
  
Interest cost on projected benefit obligation
    
329
      
333
  
Net amortizations of actuarial loss
    
158
      
168
  
Expected return on plan assets
    
(325
 )    
(326
 )
Net periodic benefit cost
   $
163
     $
177
  
Net Periodic Benefit Cost Recognized in Income Statement [Table Text Block]
   
Three Months Ended
  
   
March 31,
    
April 1,
  
   
2019
    
2018
  
   
(Unaudited)
  
Service cost:
                
Selling, general and administrative expenses
    
(1
 )    
(2
 )
Other net periodic benefit costs:
                
Other expense (income), net
    
(162
 )    
(175
 )
Total
   $
(163
 )   $
(177
 )