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Selected Quarterly Data (Unaudited) (Tables)
 12 Months Ended
Sep. 30, 2018
Selected Quarterly Data (Unaudited) [Abstract]  
Selected Quarterly Data (Unaudited)
The following table sets forth selected unaudited consolidated quarterly financial information for the years ended September 30, 2018 and 2017 (in thousands, except percentages and per share amounts):
 
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
Fiscal Year 2018:
 
Revenue
$
73,611

 
$
32,783

 
$
41,200

 
$
28,832

Gross profit
$
20,337

 
$
11,725

 
$
14,599

 
$
8,496

Gross margin
27.6
%
 
35.8
%
 
35.4
%
 
29.5
%
Operating income (loss)
$
7,766

 
$
65

 
$
2,936

 
$
(8,848
)
Income tax provision (benefit)
$
1,240

 
$
(2,780
)
 
$
1,390

 
$
370

Net income (loss) attributable to Amtech Systems, Inc.
$
6,452

 
$
2,835

 
$
4,971

 
$
(8,953
)
Net income (loss) per share attributable to Amtech Systems, Inc.:
 
 
 
 
 
 
 
Basic income (loss) per share
$
0.44

 
$
0.19

 
$
0.33

 
$
(0.61
)
Shares used in calculation
14,781

 
14,891

 
14,925

 
14,730

Diluted income (loss) per share
$
0.42

 
$
0.19

 
$
0.33

 
$
(0.61
)
Shares used in calculation
15,298

 
15,154

 
15,091

 
14,730

 
 
 
 
 
 
 
 
Fiscal Year 2017:
 
Revenue
$
29,135

 
$
32,944

 
$
47,760

 
$
54,677

Gross profit
$
8,443

 
$
8,395

 
$
15,502

 
$
19,592

Gross margin
29.0
%
 
25.5
%
 
32.5
%
 
35.8
%
Operating (loss) income
$
(180
)
 
$
(1,400
)
 
$
3,971

 
$
8,034

Income tax provision
$
90

 
$
194

 
$
986

 
$
474

Net (loss) income attributable to Amtech Systems, Inc.
$
(53
)
 
$
(1,420
)
 
$
3,287

 
$
7,317

Net (loss) income per share attributable to Amtech Systems, Inc.:
 
 
 
 
 
 
 
Basic (loss) income per share
$
—

 
$
(0.11
)
 
$
0.25

 
$
0.53

Shares used in calculation
13,179

 
13,188

 
13,242

 
13,895

Diluted (loss) income per share
$
—

 
$
(0.11
)
 
$
0.25

 
$
0.51

Shares used in calculation
13,179

 
13,188

 
13,398

 
14,294