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Net Income (Loss) Per Share (Tables)
 9 Months Ended
Sep. 30, 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
 
Nine Months Ended
 
September 30, 2018
 
October 1, 2017
 
September 30, 2018
 
October 1, 2017
Basic net income per share:
 
 
 
 
 
 
 
Net income
$
3,611

 
$
2,795

 
$
8,297

 
$
3,238

Less: Income attributable to non-vested shares
(63
)
 
(45
)
 
(147
)
 
(54
)
Less: Income attributable to preferred stock
(740
)
 
(577
)
 
(1,701
)
 
(669
)
Net income available to common stockholders
$
2,808

 
$
2,173

 
$
6,449

 
$
2,515

Weighted average common shares outstanding
35,735,680

 
35,431,806

 
35,707,245

 
35,410,482

Basic net income per share
$
0.08

 
$
0.06

 
$
0.18

 
$
0.07

Diluted net income per share:
 
 
 
 
 
 
 
Net income
$
3,611

 
$
2,795

 
$
8,297

 
$
3,238

Shares used in computing basic net income per share
35,735,680

 
35,431,806

 
35,707,245

 
35,410,482

Dilutive effect of preferred stock and non-vested shares
9,674,876

 
9,505,835

 
9,586,010

 
9,555,782

Shares used in computing diluted net income per share
45,410,556

 
44,937,641

 
45,293,255

 
44,966,264

Diluted net income per share (1)
$
0.08

 
$
0.06

 
$
0.18

 
$
0.07



(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.