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Net Income (Loss) Per Share (Tables)
 6 Months Ended
Jul. 01, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table sets forth the calculation of basic and diluted net income per share:
 
Three Months Ended
 
Six Months Ended
 
July 1, 2018
 
July 2, 2017
 
July 1, 2018
 
July 2, 2017
Basic net income per share:
 
 
 
 
 
 
 
Net income
$
7,788

 
$
6,039

 
$
4,686

 
$
443

Less: Income attributable to non-vested shares
(139
)
 
(104
)
 
(83
)
 
(8
)
Less: Income attributable to preferred stock
(1,596
)
 
(1,246
)
 
(961
)
 
(91
)
Net income available to common stockholders
$
6,053

 
$
4,689

 
$
3,642

 
$
344

Weighted average common shares outstanding
35,720,243

 
35,415,416

 
35,693,027

 
35,399,820

Basic net income per share
$
0.17

 
$
0.13

 
$
0.10

 
$
0.01

Diluted net income per share:
 
 
 
 
 
 
 
Net income
$
7,788

 
$
6,039

 
$
4,686

 
$
443

Shares used in computing basic net income per share
35,720,243

 
35,415,416

 
35,693,027

 
35,399,820

Dilutive effect of preferred stock and non-vested shares
9,481,023

 
9,526,403

 
9,541,577

 
9,580,756

Shares used in computing diluted net income per share
45,201,266

 
44,941,819

 
45,234,604

 
44,980,576

Diluted net income per share (1)
$
0.17

 
$
0.13

 
$
0.10

 
$
0.01



(1) Diluted net income per share is equal to basic net income per share for the periods presented due to the allocation of earnings to participating securities under the two-class method of calculating basic net income per share causing basic net income per share to be lower than diluted net income per share calculated under the treasury-stock method.