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Selected Quarterly Data (Unaudited) | 12 Months Ended
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Sep. 30, 2018
Selected Quarterly Data (Unaudited) [Abstract] |
Selected Quarterly Data (Unaudited) | 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 The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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