Selected Quarterly Data (Unaudited)

12 Months Ended

Sep. 30, 2015

Selected Quarterly Data (Unaudited) [Abstract]

Selected Quarterly Data (Unaudited)

Selected Quarterly Data (Unaudited)

	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
Fiscal Year 2015:	(in thousands, except per share amounts)
Revenue	$	12,396		$	24,273		$	40,016		$	28,198
Gross margin	$	3,428		$	6,889		$	10,128		$	6,563
Provision for income taxes	$	180		$	170		$	290		$	1,270
Net income (loss) attributable to Amtech Systems, Inc.	$	(5,195	)	$	(2,321	)	$	(1,604	)	$	1,349
Comprehensive income (loss) attributable to Amtech Systems, Inc.	$	(6,247	)	$	(4,470	)	$	(1,344	)	$	1,414
Net income (loss) per share attributable to Amtech Systems, Inc.:
Basic earnings per share	$	(0.53	)	$	(0.19	)	$	(0.12	)	$	0.10
Shares used in calculation	9,854			11,997			13,103			13,150
Diluted earnings per share	$	(0.53	)	$	(0.19	)	$	(0.12	)	$	0.10
Shares used in calculation	9,854			11,997			13,103			13,259
Fiscal Year 2014:
Revenue	$	14,772		$	12,717		$	9,190		$	19,822
Gross margin	$	4,535		$	2,898		$	1,631		$	2,562
Provision for (benefit of) for income taxes	$	560		$	—		$	1,325		$	(645	)
Net loss attributable to Amtech Systems, Inc.	$	(794	)	$	(3,751	)	$	(5,257	)	$	(3,245	)
Comprehensive loss attributable to Amtech Systems, Inc.	$	(66	)	$	(3,756	)	$	(5,568	)	$	(4,892	)
Net loss per share attributable to Amtech Systems, Inc.:
Basic earnings per share	$	(0.08	)	$	(0.39	)	$	(0.53	)	$	(0.33	)
Shares used in calculation	9,560			9,679			9,843			9,846
Diluted earnings per share	$	(0.08	)	$	(0.39	)	$	(0.53	)	$	(0.33	)
Shares used in calculation	9,560			9,679			9,843			9,846