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Note 17 - Employee Benefit 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
,
   
October
1
,
   
September 30
,
   
October
1
,
 
   
201
8
   
201
7
   
201
8
   
201
7
 
   
(Unaudited)
   
(Unaudited)
 
                                 
Service cost
  $
1
    $
1
    $
3
    $
4
 
Interest cost on projected benefit obligation
   
329
     
380
     
987
     
1,139
 
Net amortizations, deferrals and other costs
   
158
     
174
     
474
     
521
 
Expected return on plan assets
   
(326
)
   
(454
)
   
(978
)
   
(1,361
)
Net periodic benefit cost
  $
162
    $
101
    $
486
    $
303