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Earnings Per Share | 12 Months Ended
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Sep. 30, 2012
Earnings Per Share [Abstract] |
Earnings Per Share | 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 (loss) 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 (loss). 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 1,020,000, 145,000 and 229,000 shares are excluded from the fiscal 2012, 2011 and 2010 earnings per share calculations as they are anti-dilutive.
| 2012 |  | 2011 |  | 2010
| (dollars in thousands, except per share amounts)
Basic Earnings Per Share Computation |  |
Net income (loss) attributable to Amtech Systems, Inc. | $ | (23,031 | ) |  | $ | 22,882 |  |  | $ | 9,563 |
Weighted Average Shares Outstanding: |  |  |  |  |
Common stock | 9,471 |  |  | 9,480 |  |  | 9,022 |
Basic earnings (loss) per share attributable to Amtech shareholders | $ | (2.43 | ) |  | $ | 2.41 |  |  | $ | 1.06 |
Diluted Earnings Per Share Computation |  |  |  |  |
Net income (loss) attributable to Amtech Systems, Inc. | $ | (23,031 | ) |  | $ | 22,882 |  |  | $ | 9,563 |
Weighted Average Shares Outstanding: |  |  |  |  |
Common stock | 9,471 |  |  | 9,480 |  |  | 9,022 |
Common stock equivalents (1) | — |  |  | 284 |  |  | 215 |
Diluted shares | 9,471 |  |  | 9,764 |  |  | 9,237 |
Diluted earnings (loss) per share attributable to Amtech shareholders | $ | (2.43 | ) |  | $ | 2.34 |  |  | $ | 1.04 |
(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 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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