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Note 8 - Shareholders' Equity (Tables)
6 Months Ended
Jul. 01, 2018
Notes Tables  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
   
Three-month periods ended
   
Six-month periods ended
 
   
July 1
,
   
July 2
,
   
July 1
,
   
July 2
,
 
   
2018
   
2017
   
2018
   
2017
 
Stock Options
  $
186
    $
352
    $
309
    $
388
 
Restricted Stock Grants
   
19
     
4
     
35
     
8
 
Total
  $
205
    $
356
    $
344
    $
396
 
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
   
216,500
     
9.68
     
 
     
 
 
Exercised
   
(290,476
)    
4.56
     
 
     
 
 
Forfeited or Expired
   
(116,199
)    
11.53
     
 
     
 
 
Outstanding at July 1, 2018
   
1,670,036
    $
6.45
     
3.86
    $
5,886
 
Vested and Expected to Vest at July 1, 2018
   
1,563,589
    $
6.43
     
3.72
    $
5,584
 
Exercisable at July 1, 2018
   
981,556
    $
4.86
     
3.02
    $
4,648
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Risk-Free Interest Rate
   
2.6
%
Volatility Factor
   
47
%
Weighted Average Expected Life (Years)
   
5
 
Dividends
   
0.0
%