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Earnings Per Share & Diluted Earnings Per Share | 12 Months Ended
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Sep. 30, 2017
Earnings Per Share [Abstract] |
Earnings Per Share & Diluted Earnings Per Share | Earnings Per Share & Diluted Earnings Per Share Basic earnings per share is computed by dividing net income (loss) available to common stockholders by the weighted average number of common shares outstanding for the period. Diluted earnings per share is computed similarly to basic earnings per share except that the denominator is increased to include the number of additional common shares that would have been outstanding if potentially dilutive common shares had been issued, and the numerator is based on net income. In the case of a net loss, diluted earnings per share is calculated in the same manner as basic earnings per share. Options and restricted stock of approximately 1,364,000, 1,840,000 and 1,640,000 weighted average shares are excluded from the 2017, 2016 and 2015 earnings per share calculations as they are anti-dilutive. These shares could be dilutive in the future.
| Years ended September 30,
| 2017 |  | 2016 |  | 2015
| (dollars in thousands, except per share amounts)
Basic Earnings Per Share Computation |  |
Net income (loss) attributable to Amtech Systems, Inc. | $ | 9,131 |  |  | $ | (7,008 | ) |  | $ | (7,771 | )
Weighted Average Shares Outstanding: |  |  |  |  |
Common stock | 13,378 |  |  | 13,168 |  |  | 12,022 |
Basic income (loss) per share attributable to Amtech shareholders | $ | 0.68 |  |  | $ | (0.53 | ) |  | $ | (0.65 | )
Diluted Earnings Per Share Computation |  |  |  |  |
Net income (loss) attributable to Amtech Systems, Inc. | $ | 9,131 |  |  | $ | (7,008 | ) |  | $ | (7,771 | )
Weighted Average Shares Outstanding: |  |  |  |  |
Common stock | 13,378 |  |  | 13,168 |  |  | 12,022 |
Common stock equivalents (1) | 123 |  |  | — |  |  | — |
Diluted shares | 13,501 |  |  | 13,168 |  |  | 12,022 |
Diluted income (loss) per share attributable to Amtech shareholders | $ | 0.68 |  |  | $ | (0.53 | ) |  | $ | (0.65 | )
(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 The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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