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Earnings Per Share (Tables) | 9 Months Ended
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Jun. 30, 2012
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted |
| Three Months Ended June 30, |  | Nine Months Ended June 30,
| 2012 |  | 2011 |  | 2012 |  | 2011
| (in thousands, except per share amounts) |  | (in thousands, except per share amounts)
Basic Earnings (Loss) Per Share Computation |  |  |  |  |  |  |
Net income (loss) attributable to Amtech Systems, Inc. | $ | (2,965 | ) |  | $ | 7,298 |  |  | $ | (8,920 | ) |  | $ | 19,807 |
Weighted Average Shares Outstanding: |  |  |  |  |  |  |
Common stock | 9,479 |  |  | 9,576 |  |  | 9,468 |  |  | 9,446 |
Basic earnings (loss) per share attributable to Amtech shareholders | $ | (0.31 | ) |  | $ | 0.76 |  |  | $ | (0.94 | ) |  | $ | 2.10 |
Diluted Earnings (Loss) Per Share Computation |  |  |  |  |  |  |
Net income (loss) attributable to Amtech Systems, Inc. | $ | (2,965 | ) |  | $ | 7,298 |  |  | $ | (8,920 | ) |  | $ | 19,807 |
Weighted Average Shares Outstanding: |  |  |  |  |  |  |
Common stock | 9,479 |  |  | 9,576 |  |  | 9,468 |  |  | 9,446 |
Common stock equivalents (1) | — |  |  | 276 |  |  | — |  |  | 308 |
Diluted shares | 9,479 |  |  | 9,852 |  |  | 9,468 |  |  | 9,754 |
Diluted earnings (loss) per share attributable to Amtech shareholders | $ | (0.31 | ) |  | $ | 0.74 |  |  | $ | (0.94 | ) |  | $ | 2.03 |
(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. + References No definition available. + Details
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