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Business Segments (Tables)
 12 Months Ended
Sep. 30, 2018
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
Information concerning our business segments is as follows (in thousands):
 
Years Ended September 30,
 
2018
 
2017
 
2016
Net revenue:
 
 
 
 
 
Solar*
$
82,502

 
$
87,031

 
$
60,946

Semiconductor
80,163

 
67,237

 
50,637

Polishing
13,761

 
10,248

 
8,725

 
$
176,426

 
$
164,516

 
$
120,308

Operating income (loss):
 
 
 
 
 
Solar*
$
(7,050
)
 
$
6,060

 
$
(6,696
)
Semiconductor
11,848

 
9,538

 
3,904

Polishing
3,672

 
2,617

 
1,588

Non-segment related
(6,551
)
 
(7,790
)
 
(6,704
)
 
$
1,919

 
$
10,425

 
$
(7,908
)
* The financial statement of business units included in the Solar segment include some sales of equipment and parts to the semiconductor, silicon wafer and MEMS industries, comprising less than 25% of the Solar segment revenue.
 
Years Ended September 30,
 
2018
 
2017
 
2016
Capital expenditures:
 
 
 
 
 
Solar
$
540

 
$
1,008

 
$
235

Semiconductor
352

 
236

 
692

Polishing
603

 
12

 
51

 
$
1,495

 
$
1,256

 
$
978

Depreciation and amortization expense:
 
 
 
 
 
Solar
$
1,003

 
$
1,544

 
$
2,014

Semiconductor
715

 
876

 
870

Polishing
136

 
73

 
90

 
$
1,854

 
$
2,493

 
$
2,974

 
September 30,
2018
 
September 30,
2017
Identifiable assets:
 
 
 
Solar
$
48,898

 
$
97,999

Semiconductor
59,744

 
57,177

Polishing
6,545

 
5,078

Non-segment related
34,219

 
31,369

 
$
149,406

 
$
191,623