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Note 11 - Stock Incentive Plans (Tables)
 12 Months Ended
Dec. 30, 2017
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
 
 
 
  
 
 
 
  
Weighted
    
Aggregate
  
   
 
 
 
  
Weighted
    
Average
    
Intrinsic
  
   
Number of
    
Average
    
Remaining
    
Value
  
   
Shares
    
Exercise Price
    
Contractual Term
    
(in thousands)
  
Outstanding, January 3, 2015
    
714,451
     $
8.14
      
 
      
 
  
Granted
    
71,517
      
20.58
      
 
      
 
  
Exercised
    
(150,409
 )    
6.07
      
 
      
 
  
Forfeited
    
(19,003
 )    
12.15
      
 
      
 
  
Canceled or expired
    
(41,705
 )    
32.95
      
 
      
 
  
Outstanding, January 2, 2016
    
574,851
      
8.30
      
 
      
 
  
Granted
    
213,156
      
13.68
      
 
      
 
  
Exercised
    
(30,223
 )    
5.91
      
 
      
 
  
Forfeited
    
-
      
-
      
 
      
 
  
Canceled or expired
    
-
      
-
      
 
      
 
  
Outstanding, December 31, 2016
  
 
757,784
   
 
9.91
   
 
 
 
  
 
 
 
Granted
  
 
72,051
   
 
8.85
   
 
 
 
  
 
 
 
Exercised
  
 
(1,269
)
  
 
6.36
   
 
 
 
  
 
 
 
Forfeited
  
 
(26,795
)
  
 
13.45
   
 
 
 
  
 
 
 
Canceled or expired
  
 
(10,204
)
  
 
12.51
   
 
 
 
  
 
 
 
Outstanding, December 30, 2017
  
 
791,567
   
$
9.67
   
 
5.8
   
$
1,228
 
                                 
Options Exercisable As Of:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
December 30, 2017
  
 
569,361
   
$
8.46
   
 
4.8
   
$
1,203
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
2017
    
2016
    
2015
  
                                 
Dividend yield
  
 
0%
      
 
0%
 
      
 
0%
 
  
Historical volatility
  
 
47%
      
52%
-
55%
      
51%
-
58%
  
Risk-free rate
  
 
2%
      
1.4%
-
1.6%
      
1.5%
-
1.8%
  
Expected life (in years)
  
 
6
      
 
6
 
      
 
6
 
  
Weighted average grant date fair value
    
$4.18
      
 
$7.13
 
      
 
$11.20
 
  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
   
Restricted Stock
    
Performance Shares
  
   
 
 
 
  
Weighted
    
 
 
 
  
Weighted
  
   
 
 
 
  
Average
   
 
 
 
  
Average
 
   
Number of
    
Grant Date
    
Number of
    
Grant Date
  
   
Shares
    
Fair Value
    
Shares
    
Fair Value
  
Outstanding, January 3, 2015
    
419,674
     $
7.64
      
-
     $
-
  
Granted
    
107,004
      
19.59
      
86,222
      
20.71
  
Vested
    
(205,137
 )    
7.84
      
-
      
-
  
Forfeited
    
(44,988
 )    
8.89
      
(2,160
 )    
20.80
  
Canceled
    
-
      
-
      
-
      
-
  
Outstanding, January 2, 2016
    
276,553
      
11.93
      
84,062
      
20.70
  
Granted
    
203,613
      
13.58
      
176,611
      
13.68
  
Vested
    
(152,548
 )    
11.22
      
(7,039
 )    
20.56
  
Forfeited
    
(11,502
 )    
13.45
      
-
      
-
  
Canceled
    
-
      
—
      
(12,493
 )    
20.56
  
Outstanding, December 31, 2016
  
 
316,116
   
 
13.30
   
 
241,141
   
 
15.39
 
Granted
  
 
258,060
   
 
9.18
   
 
83,897
   
 
8.85
 
Vested
  
 
(179,132
)
  
 
12.20
   
 
(6,472
)
  
 
20.54
 
Forfeited
  
 
(33,505
)
  
 
12.55
   
 
(15,247
)
  
 
14.28
 
Canceled
  
 
-
   
 
—
    
 
(13,704
)
  
 
13.68
 
Outstanding, December 30, 2017
  
 
361,539
   
$
10.97
   
 
289,615
   
$
13.66