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Business Segments (Tables)
 12 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
Information concerning our business segments is as follows:
 
Years Ended September 30,
 
2017
 
2016
 
2015
 
(dollars in thousands)
Net revenue:
 
 
 
 
 
Solar*
$
87,031

 
$
60,946

 
$
56,689

Semiconductor
67,237

 
50,637

 
37,250

Polishing
10,248

 
8,725

 
10,944

 
$
164,516

 
$
120,308

 
$
104,883

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

 
$
(6,696
)
 
$
(5,056
)
Semiconductor
9,538

 
3,904

 
(1,268
)
Polishing
2,617

 
1,588

 
2,250

Non-segment related
(7,790
)
 
(6,704
)
 
(9,447
)
 
$
10,425

 
$
(7,908
)
 
$
(13,521
)
* 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,
 
2017
 
2016
 
2015
 
(dollars in thousands)
Capital expenditures:
 
 
 
 
 
Solar
$
1,008

 
$
235

 
$
411

Semiconductor
236

 
692

 
136

Polishing
12

 
51

 
63

 
$
1,256

 
$
978

 
$
610

Depreciation and amortization expense:
 
 
 
 
 
Solar
$
1,544

 
$
2,014

 
$
2,940

Semiconductor
876

 
870

 
318

Polishing
73

 
90

 
99

 
$
2,493

 
$
2,974

 
$
3,357

 
September 30,
2017
 
September 30,
2016
 
(dollars in thousands)
Identifiable assets:
 
 
 
Solar
$
97,999

 
$
42,962

Semiconductor
57,177

 
51,985

Polishing
5,078

 
4,819

Non-segment related
31,369

 
18,664

 
$
191,623

 
$
118,430