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Earnings Per Share (Tables) | 9 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Basic and Diluted Earnings Per Share | The following table outlines basic and diluted EPS:
| Three Months Ended June 30, |  | Nine Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in thousands, except per share amounts)
Basic Income (Loss) Per Share Computation |  |  |  |  |  |  |
Net income (loss) attributable to Amtech Systems, Inc. | $ | 3,287 |  |  | $ | (1,209 | ) |  | $ | 1,812 |  |  | $ | (6,722 | )
Weighted Average Shares Outstanding: |  |  |  |  |  |  |
Common stock | 13,242 |  |  | 13,173 |  |  | 13,203 |  |  | 13,165 |
Basic income (loss) per share attributable to Amtech shareholders | $ | 0.25 |  |  | $ | (0.09 | ) |  | $ | 0.14 |  |  | $ | (0.51 | )
Diluted Income (Loss) Per Share Computation |  |  |  |  |  |  |
Net income (loss) attributable to Amtech Systems, Inc. | $ | 3,287 |  |  | $ | (1,209 | ) |  | $ | 1,812 |  |  | $ | (6,722 | )
Weighted Average Shares Outstanding: |  |  |  |  |  |  |
Common stock | 13,242 |  |  | 13,173 |  |  | 13,203 |  |  | 13,165 |
Common stock equivalents (1) | 156 |  |  | — |  |  | 85 |  |  | — |
Diluted shares | 13,398 |  |  | 13,173 |  |  | 13,288 |  |  | 13,165 |
Diluted income (loss) per share attributable to Amtech shareholders | $ | 0.25 |  |  | $ | (0.09 | ) |  | $ | 0.14 |  |  | $ | (0.51 | )

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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