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Note 8 - Shareholders' Equity (Tables)
3 Months Ended
Apr. 01, 2018
Notes Tables  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
   
Three-Month Periods E
nded
 
   
April 1,
   
April 2
,
 
   
2018
   
2017
 
Stock Options
  $
123
    $
36
 
Restricted Stock Grants
   
16
     
4
 
Total
  $
139
    $
40
 
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, 2018
   
1,860,211
    $
6.10
     
 
     
 
 
Granted
   
14,000
     
7.16
     
 
     
 
 
Exercised
   
(221,009
)    
4.60
     
 
     
 
 
Forfeited or Expired
   
(114,449
)    
11.60
     
 
     
 
 
Outstanding at April 1, 2018
   
1,538,753
    $
5.91
     
3.62
    $
6,786
 
Vested and Expected to Vest at April 1, 2018
   
1,449,498
    $
5.96
     
3.50
    $
6,350
 
Exercisable at April 1, 2018
   
917,915
    $
4.82
     
2.89
    $
4,751
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Risk-Free Interest Rate
   
1.7
%
Volatility Factor
   
50
%
Weighted Average Expected Life (Years)
   
5
 
Dividends
   
0.0
%