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Earnings Per Share (Tables) | 6 Months Ended
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Mar. 31, 2015
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted |
| Three Months Ended March 31, |  | Six Months Ended March 31,
| 2015 |  | 2014 |  | 2015 |  | 2014
| (in thousands, except per share amounts) |  | (in thousands, except per share amounts)
Basic Loss Per Share Computation |  |  |  |  |  |  |
Net loss attributable to Amtech Systems, Inc. | $ | (2,321 | ) |  | $ | (3,751 | ) |  | $ | (7,515 | ) |  | $ | (4,545 | )
Weighted Average Shares Outstanding: |  |  |  |  |  |  |
Common stock | 11,997 |  |  | 9,679 |  |  | 10,914 |  |  | 9,619 |
Basic loss per share attributable to Amtech shareholders | $ | (0.19 | ) |  | $ | (0.39 | ) |  | $ | (0.69 | ) |  | $ | (0.47 | )
Diluted Loss Per Share Computation |  |  |  |  |  |  |
Net loss attributable to Amtech Systems, Inc. | $ | (2,321 | ) |  | $ | (3,751 | ) |  | $ | (7,515 | ) |  | $ | (4,545 | )
Weighted Average Shares Outstanding: |  |  |  |  |  |  |
Common stock | 11,997 |  |  | 9,679 |  |  | 10,914 |  |  | 9,619 |
Common stock equivalents (1) | — |  |  | — |  |  | — |  |  | — |
Diluted shares | 11,997 |  |  | 9,679 |  |  | 10,914 |  |  | 9,619 |
Diluted loss per share attributable to Amtech shareholders | $ | (0.19 | ) |  | $ | (0.39 | ) |  | $ | (0.69 | ) |  | $ | (0.47 | )
(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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