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Earnings Per Share (Tables) | 12 Months Ended
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Sep. 30, 2015
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted |
| Years ended September 30,
| 2015 |  | 2014 |  | 2013
| (dollars in thousands, except per share amounts)
Basic Earnings Per Share Computation |  |
Net loss attributable to Amtech Systems, Inc. | $ | (7,771 | ) |  | $ | (13,047 | ) |  | $ | (20,069 | )
Weighted Average Shares Outstanding: |  |  |  |  |
Common stock | 12,022 |  |  | 9,732 |  |  | 9,529 |
Basic loss per share attributable to Amtech shareholders | $ | (0.65 | ) |  | $ | (1.34 | ) |  | $ | (2.11 | )
Diluted Earnings Per Share Computation |  |  |  |  |
Net loss attributable to Amtech Systems, Inc. | $ | (7,771 | ) |  | $ | (13,047 | ) |  | $ | (20,069 | )
Weighted Average Shares Outstanding: |  |  |  |  |
Common stock | 12,022 |  |  | 9,732 |  |  | 9,529 |
Common stock equivalents (1) | — |  |  | — |  |  | — |
Diluted shares | 12,022 |  |  | 9,732 |  |  | 9,529 |
Diluted loss per share attributable to Amtech shareholders | $ | (0.65 | ) |  | $ | (1.34 | ) |  | $ | (2.11 | )
(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://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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