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Selected Quarterly Data (Unaudited) (Tables) | 12 Months Ended
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Sep. 30, 2018
Selected Quarterly Data (Unaudited) [Abstract] |
Selected Quarterly Data (Unaudited) | The following table sets forth selected unaudited consolidated quarterly financial information for the years ended September 30, 2018 and 2017 (in thousands, except percentages and per share amounts):
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Fiscal Year 2018: |
Revenue | $ | 73,611 |  |  | $ | 32,783 |  |  | $ | 41,200 |  |  | $ | 28,832 |
Gross profit | $ | 20,337 |  |  | $ | 11,725 |  |  | $ | 14,599 |  |  | $ | 8,496 |
Gross margin | 27.6 | % |  | 35.8 | % |  | 35.4 | % |  | 29.5 | %
Operating income (loss) | $ | 7,766 |  |  | $ | 65 |  |  | $ | 2,936 |  |  | $ | (8,848 | )
Income tax provision (benefit) | $ | 1,240 |  |  | $ | (2,780 | ) |  | $ | 1,390 |  |  | $ | 370 |
Net income (loss) attributable to Amtech Systems, Inc. | $ | 6,452 |  |  | $ | 2,835 |  |  | $ | 4,971 |  |  | $ | (8,953 | )
Net income (loss) per share attributable to Amtech Systems, Inc.: |  |  |  |  |  |  |
Basic income (loss) per share | $ | 0.44 |  |  | $ | 0.19 |  |  | $ | 0.33 |  |  | $ | (0.61 | )
Shares used in calculation | 14,781 |  |  | 14,891 |  |  | 14,925 |  |  | 14,730 |
Diluted income (loss) per share | $ | 0.42 |  |  | $ | 0.19 |  |  | $ | 0.33 |  |  | $ | (0.61 | )
Shares used in calculation | 15,298 |  |  | 15,154 |  |  | 15,091 |  |  | 14,730 |
Fiscal Year 2017: |
Revenue | $ | 29,135 |  |  | $ | 32,944 |  |  | $ | 47,760 |  |  | $ | 54,677 |
Gross profit | $ | 8,443 |  |  | $ | 8,395 |  |  | $ | 15,502 |  |  | $ | 19,592 |
Gross margin | 29.0 | % |  | 25.5 | % |  | 32.5 | % |  | 35.8 | %
Operating (loss) income | $ | (180 | ) |  | $ | (1,400 | ) |  | $ | 3,971 |  |  | $ | 8,034 |
Income tax provision | $ | 90 |  |  | $ | 194 |  |  | $ | 986 |  |  | $ | 474 |
Net (loss) income attributable to Amtech Systems, Inc. | $ | (53 | ) |  | $ | (1,420 | ) |  | $ | 3,287 |  |  | $ | 7,317 |
Net (loss) income per share attributable to Amtech Systems, Inc.: |  |  |  |  |  |  |
Basic (loss) income per share | $ | — |  |  | $ | (0.11 | ) |  | $ | 0.25 |  |  | $ | 0.53 |
Shares used in calculation | 13,179 |  |  | 13,188 |  |  | 13,242 |  |  | 13,895 |
Diluted (loss) income per share | $ | — |  |  | $ | (0.11 | ) |  | $ | 0.25 |  |  | $ | 0.51 |
Shares used in calculation | 13,179 |  |  | 13,188 |  |  | 13,398 |  |  | 14,294 |

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- Definition Selected Quarterly Data (Unaudited) [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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