Selected Quarterly Data (Unaudited)

12 Months Ended

Sep. 30, 2017

Selected Quarterly Data (Unaudited) [Abstract]

Selected Quarterly Data (Unaudited)

Selected Quarterly Data (Unaudited)

	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
Fiscal Year 2017:	(in thousands, except per share amounts)
Revenue	$	29,135		$	32,944		$	47,760		$	54,677
Gross profit	$	8,443		$	8,395		$	15,502		$	19,592
Provision for income taxes	$	90		$	194		$	986		$	474
Net income (loss) attributable to Amtech Systems, Inc.	$	(53	)	$	(1,420	)	$	3,287		$	7,317
Net income (loss) per share attributable to Amtech Systems, Inc.:
Basic earnings per share	$	0.00		$	(0.11	)	$	0.25		$	0.53
Shares used in calculation	13,179			13,188			13,242			13,895
Diluted earnings per share	$	0.00		$	(0.11	)	$	0.25		$	0.51
Shares used in calculation	13,179			13,188			13,398			14,294
Fiscal Year 2016:
Revenue	$	22,074		$	22,483		$	33,342		$	42,409
Gross profit	$	5,955		$	6,001		$	9,631		$	12,476
Provision for income taxes	$	300		$	1,670		$	70		$	1,060
Net loss attributable to Amtech Systems, Inc.	$	(4,015	)	$	(1,499	)	$	(1,209	)	$	(285	)
Net loss per share attributable to Amtech Systems, Inc.:
Basic loss per share	$	(0.31	)	$	(0.11	)	$	(0.09	)	$	(0.02	)
Shares used in calculation	13,152			13,169			13,173			13,177
Diluted loss per share	$	(0.31	)	$	(0.11	)	$	(0.09	)	$	(0.02	)
Shares used in calculation	13,152			13,169			13,173			13,177