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Earnings Per Share (Tables)
 9 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Basic and Diluted Earnings Per Share
The following table outlines basic and diluted EPS:

 
Three Months Ended June 30,
 
Nine Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
 
(in thousands, except per share amounts)
Basic Income (Loss) Per Share Computation
 
 
 
 
 
 
 
Net income (loss) attributable to Amtech Systems, Inc.
$
3,287

 
$
(1,209
)
 
$
1,812

 
$
(6,722
)
Weighted Average Shares Outstanding:
 
 
 
 
 
 
 
Common stock
13,242

 
13,173

 
13,203

 
13,165

Basic income (loss) per share attributable to Amtech shareholders
$
0.25

 
$
(0.09
)
 
$
0.14

 
$
(0.51
)
Diluted Income (Loss) Per Share Computation
 
 
 
 
 
 
 
Net income (loss) attributable to Amtech Systems, Inc.
$
3,287

 
$
(1,209
)
 
$
1,812

 
$
(6,722
)
Weighted Average Shares Outstanding:
 
 
 
 
 
 
 
Common stock
13,242

 
13,173

 
13,203

 
13,165

Common stock equivalents (1)
156

 
—

 
85

 
—

Diluted shares
13,398

 
13,173

 
13,288

 
13,165

Diluted income (loss) per share attributable to Amtech shareholders
$
0.25

 
$
(0.09
)
 
$
0.14

 
$
(0.51
)