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Earnings Per Share (Tables)
 6 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Basic and Diluted Earnings Per Share
The following table outlines basic and diluted EPS, in thousands, except per share amounts:

 
Three Months Ended March 31,
 
Six Months Ended March 31,
 
2018
 
2017
 
2018
 
2017
Basic Income (Loss) Per Share Computation
 
 
 
 
 
 
 
Net income (loss) attributable to Amtech Systems, Inc.
$
2,835

 
$
(1,420
)
 
$
9,287

 
$
(1,475
)
Weighted Average Shares Outstanding:
 
 
 
 
 
 
 
Common stock
14,891

 
13,188

 
14,835

 
13,184

Basic income (loss) per share attributable to Amtech shareholders
$
0.19

 
$(0.11)
 
$
0.63

 
$
(0.11
)
Diluted Income (Loss) Per Share Computation
 
 
 
 
 
 
 
Net income (loss) attributable to Amtech Systems, Inc.
$
2,835

 
$
(1,420
)
 
$
9,287

 
$
(1,475
)
Weighted Average Shares Outstanding:
 
 
 
 
 
 
 
Common stock
14,891

 
13,188

 
14,835

 
13,184

Common stock equivalents (1)
263

 
—

 
388

 
—

Diluted shares
15,154

 
13,188

 
15,223

 
13,184

Diluted income (loss) per share attributable to Amtech shareholders
$
0.19

 
$(0.11)
 
$
0.61

 
$
(0.11
)

(1) The number of common stock equivalents is calculated using the treasury method and the average market price during the period.