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Earnings (Loss) Per Share (Tables)
 6 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Diluted earnings per share
Diluted earnings (loss) per share is calculated using the treasury stock method.

 
 
Three Months Ended
 
Six Months Ended
 
 
March 31,
 
March 31,
 
 
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
 
     Net income (loss)
 
$
1,316

 
$
979

 
$
(1,535
)
 
$
1,303

Denominator:
 
 
 
 
 
 
 
 
Denominator for basic net income per share - weighted-average outstanding shares
 
11,889

 
11,249

 
11,863

 
11,225

Effect of dilutive securities:
 
 
 
 
 
 
 
 
Stock options and restricted stock
 
997

 
1,496

 
—

 
1,488

Denominator for diluted net income per share - weighted-average outstanding shares
 
12,886

 
12,745

 
11,863

 
12,713

 
 
 
 
 
 
 
 
 
Net income (loss) per share - basic
 
$
0.11

 
$
0.09

 
$
(0.13
)
 
$
0.12

Net income (loss) per share-diluted
 
$
0.10

 
$
0.08

 
$
(0.13
)
 
$
0.10