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Computation of Earnings per Share (Tables)
 6 Months Ended
Nov. 30, 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 November 30, 2015 and 2014:
 
Three Months Ended 
 November 30,
 
Six Months Ended 
 November 30,
 
2015
 
2014
 
2015
 
2014
Denominator:
 
 
 
 
 
 
 
Denominator for basic earnings per share - weighted average common shares outstanding (including shares issuable for vested restricted stock units)
24,440

 
24,404

 
24,426

 
24,380

Effect of unvested restricted stock units
7

 
4

 
7

 
13

Diluted shares used in per share calculation
24,447


24,408


24,433


24,393

Net income
$
2,190

 
$
4,795

 
$
4,660

 
$
9,566

Earnings per share:
 
 
 
 
 
 
 
Basic
$
0.09

 
$
0.20


$
0.19


$
0.39

Diluted
$
0.09

 
$
0.20


$
0.19


$
0.39