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Calculation of earnings per share and weighted average shares outstanding (Tables)
 3 Months Ended
Dec. 31, 2016
Calculation of earnings per share and weighted average shares outstanding [Abstract]  
Basic and fully diluted earnings per share
Basic and diluted net (loss) income per common share for the three month periods ended December 31, 2016 and January 2, 2016, is calculated as follows:

(in thousands of dollars except per share data)
 
  
Three months ended
 
  
December 31,
2016
  
January 2,
2016
 
       
Numerator:
      
Net (loss) income attributable to common stockholders for computing net (loss) income per ordinary share – basic
 
$
(2,518
)
 
$
11
 
Denominator:
        
Weighted average shares used in calculating net income (loss) per ordinary share – basic
  
5,214
   
3,429
 
Adjustment for shares issuable upon vesting of restricted stock
  
-
   
147
 
Weighted average shares used in calculating net (loss) income per ordinary share – diluted
  
5,214
   
3,576
 
Net (loss) income per ordinary share – basic
 
$
(0.48
)
 
$
0.00
 
Net (loss) income per ordinary share – diluted
 
$
(0.48
)
 
$
0.00