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Computation of Earnings Per Share (Tables)
 3 Months Ended
Aug. 31, 2015
Earnings Per Share [Abstract]  
Reconciliation of Denominator Used in Computation of Basic and Diluted Earnings per Share
The following is a reconciliation of the denominator used in the computation of basic and diluted earnings per share for the three months ended August 31, 2015 and 2014:
 
Three Months Ended 
 August 31,
 
2015
 
2014
Denominator:
 
 
 
Denominator for basic earnings per share - weighted average common shares outstanding (including shares issuable for vested restricted stock units)
24,416

 
24,372

Effect of unvested restricted stock units
10

 
24

Diluted shares used in per share calculation
24,426


24,396

Net income
$
2,470

 
$
4,771

Earnings per share:
 
 
 
Basic
$
0.10

 
$
0.20

Diluted
$
0.10

 
$
0.20