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Business Segment Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2019 USD ($) segment | Mar. 31, 2018 USD ($) | Sep. 30, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of business segments | segment |  |  | 3 |  |
Net revenues | $ 20,633 | $ 21,115 | $ 43,858 | $ 48,231 |
Operating income (loss) | 1,248 | 1,485 | 1,912 | 4,346 |
Identifiable assets | 131,604 |  | 131,604 |  | $ 149,406
Operating Segments | Solar |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | 16,053 | 16,582 | 35,013 | 37,473 |
Operating income (loss) | 1,732 | 2,257 | 4,477 | 5,261 |
Identifiable assets | 60,362 |  | 60,362 |  | 59,744
Operating Segments | SiC/LED |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | 3,273 | 3,603 | 6,256 | 7,126 |
Operating income (loss) | 877 | 1,111 | 1,646 | 2,215 |
Identifiable assets | 7,848 |  | 7,848 |  | 6,545
Operating Segments | Automation |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | 1,307 | 930 | 2,589 | 3,632 |
Operating income (loss) | (116) | (483) | (340) | (36) |
Identifiable assets | 3,995 |  | 3,995 |  | 3,586
Non-Segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income (loss) | (1,245) | $ (1,400) | (3,871) | $ (3,094) |
Identifiable assets | 33,422 |  | 33,422 |  | 34,209
Discontinued Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Identifiable assets | $ 25,977 |  | $ 25,977 |  | $ 45,322

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