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Earnings Per Share (Tables)
 3 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Basic and Diluted Earnings Per Share

 
Three Months Ended December 31,
 
2018
 
2017
Numerator:
 
 
 
Net (loss) income attributable to Amtech Systems, Inc.
$
(2,372
)
 
$
6,452

 
 
 
 
Denominator:
 
 
 
Weighted-average shares used to compute basic EPS
14,220

 
14,781

Common stock equivalents (1)
—

 
517

Weighted-average shares used to compute diluted EPS
14,220

 
15,298

 
 
 
 
Basic (loss) income per share attributable to Amtech shareholders
$
(0.17
)
 
$
0.44

Diluted (loss) income per share attributable to Amtech shareholders
$
(0.17
)
 
$
0.42


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