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Note 8 - Shareholders' Equity (Tables)
 3 Months Ended
Apr. 02, 2017
Notes Tables  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
 
 
Three month periods ended
 
 
 
April 2,
2017
 
 
March 27,
2016
 
Stock options
   $
36
     $
170
  
Restricted stock
    
 4
      
 11
  
Total
   $
40
     $
181
  
Share-based Compensation, Stock Options, Activity [Table Text Block]
 
 
Number of
Shares
 
 
Weighted
Average
Exercise
Price
 
 
Weighted
Average
Remaining
Contractual
Term (years)
 
 
Aggregate
Intrinsic
Value
 
Outstanding at January 1, 2017
    
2,323,581
     $
6.22
      
 
      
 
  
Granted
    
65,000
     $
5.31
      
 
      
 
  
Exercised
    
(180,334
 )   $ 
4.11
      
 
      
 
  
Forfeited or expired
    
(113,166
 )   $ 
11.55
      
 
      
 
  
Outstanding at April 2, 2017
    
2,095,081
     $ 
6.08
      
3.11
     $
1,502
  
Vested and expected to vest at April 2, 2017
    
1,984,765
     $ 
6.15
      
3.00
     $
1,403
  
Exercisable at April 2, 2017
    
1,265,548
     $
5.07
      
2.08
     $
1,035