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Business Segment Information (Tables)
 9 Months Ended
Jun. 30, 2018
Segment Reporting [Abstract]  
Business Segment Information
Information concerning our business segments is as follows, in thousands:
 
Three Months Ended June 30,
 
Nine Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Net Revenues:
 
 
 
 
 
 
 
Solar *
$
14,134

 
$
28,981

 
$
75,929

 
$
56,960

Semiconductor
23,472

 
15,951

 
60,945

 
45,097

Polishing
3,594

 
2,828

 
10,720

 
7,782

 
$
41,200

 
$
47,760

 
$
147,594

 
$
109,839

Operating income (loss):
 
 
 
 
 
 
 
Solar *
$
(85
)
 
$
2,991

 
$
3,364

 
$
90

Semiconductor
3,861

 
2,250

 
9,122

 
6,013

Polishing
938

 
738

 
3,153

 
1,705

Non-segment related
(1,778
)
 
(2,008
)
 
(4,872
)
 
(5,420
)
 
$
2,936

 
$
3,971

 
$
10,767

 
$
2,388


* 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.

 
June 30,
2018
 
September 30,
2017
Identifiable Assets:
 
 
 
Solar
$
59,726

 
$
97,999

Semiconductor
60,048

 
57,177

Polishing
6,476

 
5,078

Non-segment related
36,191

 
31,369

 
$
162,441

 
$
191,623