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Note 14 - Employee Benefit Plans (Tables)
 3 Months Ended
Apr. 05, 2020
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   
Three Months Ended
 
   
April 5,
    
March 31,
  
   
2020
    
2019
  
   
(Unaudited)
 
Service cost
   $
1
     $
1
  
Interest cost on projected benefit obligation
    
352
      
329
  
Net amortizations of actuarial loss
    
166
      
158
  
Expected return on plan assets
    
(270
 )    
(325
 )
Net periodic benefit cost
   $
249
     $
163
  
Net Periodic Benefit Cost Recognized in Income Statement [Table Text Block]
   
Three Months Ended
 
   
April 5,
    
March 31,
  
   
2020
    
2019
  
   
(Unaudited)
 
Service cost:
                
Selling, general and administrative expenses
   $
(1
 )   $
(1
 )
Other net periodic benefit costs:
                
Other expense (income), net
    
(248
 )    
(162
 )
Total
   $
(249
 )   $
(163
 )