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Consolidated Statements Of Stockholders' Equity And Comprehensive Income (Loss) (USD $) In Thousands, except Share data | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings (Accumulated Deficit) [Member] | Total Amtech Systems Inc. Stockholders' Equity [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Sep. 30, 2008 | $ 74,533 | $ 91 | $ 70,135 | $ 67 | $ 4,240 | $ 74,533 |
Beginning balance, shares at Sep. 30, 2008 |  | 9,096,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) | (1,589) |  |  |  | (1,589) | (1,589) |
Translation adjustment | 594 |  |  | 594 |  | 594 |
Comprehensive income (loss) | (995) |  |  |  |  | (995) |
Share repurchase, shares |  | (144,000) |  |  |  |  |
Share repurchase | (447) | (1) | (446) |  |  | (447) |
Stock compensation expense | 711 |  | 711 |  |  | 711 |
Restricted shares released |  | 8,000 |  |  |  |  |
Stock options exercised, shares |  | 2,000 |  |  |  |  |
Stock options exercised | 3 |  | 3 |  |  | 3 |
Ending balance at Sep. 30, 2009 | 73,805 | 90 | 70,403 | 661 | 2,651 | 73,805 |
Ending balance, shares at Sep. 30, 2009 |  | 8,962,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) | 9,563 |  |  |  | 9,563 | 9,563 |
Translation adjustment | (1,643) |  |  | (1,643) |  | (1,643) |
Comprehensive income (loss) | 7,920 |  |  |  |  | 7,920 |
Tax benefit of stock options | 202 |  | 202 |  |  | 202 |
Stock compensation expense | 987 |  | 987 |  |  | 987 |
Restricted shares released |  | 34,000 |  |  |  |  |
Stock options exercised, shares |  | 214,000 |  |  |  |  |
Stock options exercised | 1,329 | 2 | 1,327 |  |  | 1,329 |
Ending balance at Sep. 30, 2010 | 84,243 | 92 | 72,919 | (982) | 12,214 | 84,243 |
Ending balance, shares at Sep. 30, 2010 | 9,209,213 | 9,210,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) | 22,119 |  |  |  | 22,882 | 22,882 | (763)
Translation adjustment | (1,136) |  |  | (1,096) |  | (1,096) | (40)
Comprehensive income (loss) | 20,983 |  |  |  |  | 21,786 | (803)
Deferred tax asset recorded due to legal reorganization | 4,025 |  | 4,025 |  |  | 4,025 |
Acquired interest in Kingstone, shares |  | 153,000 |  |  |  |  |
Acquired interest in Kingstone | 10,650 | 2 | 3,833 |  |  | 3,835 | 6,815
Share repurchase, shares |  | (153,000) |  |  |  |  |
Share repurchase | (1,225) | (2) | (1,223) |  |  | (1,225) |
Tax benefit of stock options | 855 |  | 855 |  |  | 855 |
Stock compensation expense | 1,470 |  | 1,470 |  |  | 1,470 |
Restricted shares released |  | 43,000 |  |  |  |  |
Stock options exercised, shares |  | 178,000 |  |  |  |  |
Stock options exercised | 1,330 | 2 | 1,328 |  |  | 1,330 |
Ending balance at Sep. 30, 2011 | $ 122,331 | $ 94 | $ 83,207 | $ (2,078) | $ 35,096 | $ 116,319 | $ 6,012
Ending balance, shares at Sep. 30, 2011 | 9,431,393 | 9,431,000 |  |  |  |  |

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