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Earnings Per Share & Diluted Earnings Per Share (Tables) | 12 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | A reconciliation of the denominators of the basic and diluted EPS calculations follows (in thousands, except per share amounts):
| Years ended September 30,
| 2018 |  | 2017 |  | 2016
Numerator: |  |
Net income (loss) attributable to Amtech Systems, Inc. | $ | 5,305 |  |  | $ | 9,131 |  |  | $ | (7,008 | )
Denominator: |  |  |  |  |
Weighted-average shares used to compute basic EPS | 14,833 |  |  | 13,378 |  |  | 13,168 |
Common stock equivalents (1) | 232 |  |  | 123 |  |  | — |
Weighted-average shares used to compute diluted EPS | 15,065 |  |  | 13,501 |  |  | 13,168 |
Basic income (loss) per share attributable to Amtech shareholders | $ | 0.36 |  |  | $ | 0.68 |  |  | $ | (0.53 | )
Diluted income (loss) per share attributable to Amtech shareholders | $ | 0.35 |  |  | $ | 0.68 |  |  | $ | (0.53 | )
(1) The number of common stock equivalents is calculated using the treasury stock method and the average market price during the period.

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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://fasb.org/us-gaap/role/ref/legacyRef -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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