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Business Segment Information (Tables)
 6 Months Ended
Mar. 31, 2018
Segment Reporting [Abstract]  
Business Segment Information
Information concerning our business segments is as follows, in thousands:
 
Three Months Ended March 31,
 
Six Months Ended March 31,
 
2018
 
2017
 
2018
 
2017
Net Revenues:
 
 
 
 
 
 
 
Solar *
$
12,598

 
$
16,555

 
$
61,795

 
$
27,979

Semiconductor
16,582

 
13,443

 
37,473

 
29,146

Polishing
3,603

 
2,946

 
7,126

 
4,954

 
$
32,783

 
$
32,944

 
$
106,394

 
$
62,079

Operating income (loss):
 
 
 
 
 
 
 
Solar *
$
(1,903
)
 
$
(1,878
)
 
$
3,449

 
$
(2,901
)
Semiconductor
2,257

 
1,403

 
5,261

 
3,763

Polishing
1,111

 
503

 
2,215

 
967

Non-segment related
(1,400
)
 
(1,428
)
 
(3,094
)
 
(3,412
)
 
$
65

 
$
(1,400
)
 
$
7,831

 
$
(1,583
)

* 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.

 
March 31,
2018
 
September 30,
2017
Identifiable Assets:
 
 
 
Solar
$
71,147

 
$
97,999

Semiconductor
59,761

 
57,177

Polishing
6,814

 
5,078

Non-segment related
33,295

 
31,369

 
$
171,017

 
$
191,623