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Note 14 - Reportable Segments (Tables)
 3 Months Ended
Apr. 01, 2017
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended
  
   
April 1,
    
March 31,
  
   
2017
    
2016
  
Gross revenues
                
INF
   $
39,126
    $
34,287
 
BES
    
25,967
     
11,580
 
Elimination of inter- segment revenues
    
(1,034
 )    
(962
 )
Total gross revenues
   $
64,059
    $
44,905
 
                 
                 
Segment income before taxes
                
INF
   $
5,757
    $
5,588
 
BES
    
2,484
     
1,455
 
Total Segment income before taxes
    
8,241
     
7,043
 
Corporate                 
(1)
    
(5,959
 )    
(3,790
 )
Total income before taxes
   $
2,282
    $
3,253