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Earnings Per Share
 12 Months Ended
Sep. 30, 2012
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share
 
Basic earnings per share is computed by dividing net income (loss) available to common stockholders by the weighted average number of common shares outstanding for the period. Diluted earnings (loss) per share is computed similarly to basic earnings per share except that the denominator is increased to include the number of additional common shares that would have been outstanding if potentially dilutive common shares had been issued, and the numerator is based on net income (loss). In the case of a net loss, diluted earnings per share is calculated in the same manner as basic earnings per share. Options and restricted stock of approximately 1,020,000, 145,000 and 229,000 shares are excluded from the fiscal 2012, 2011 and 2010 earnings per share calculations as they are anti-dilutive.
 
 
2012
 
2011
 
2010
 
(dollars in thousands, except per share amounts)
Basic Earnings Per Share Computation
 
 
Net income (loss) attributable to Amtech Systems, Inc.
$
(23,031
)
 
$
22,882

 
$
9,563

Weighted Average Shares Outstanding:
 
 
 
 
 
Common stock
9,471

 
9,480

 
9,022

Basic earnings (loss) per share attributable to Amtech shareholders
$
(2.43
)
 
$
2.41

 
$
1.06

Diluted Earnings Per Share Computation
 
 
 
 
 
Net income (loss) attributable to Amtech Systems, Inc.
$
(23,031
)
 
$
22,882

 
$
9,563

Weighted Average Shares Outstanding:
 
 
 
 
 
Common stock
9,471

 
9,480

 
9,022

Common stock equivalents (1)
—

 
284

 
215

Diluted shares
9,471

 
9,764

 
9,237

Diluted earnings (loss) per share attributable to Amtech shareholders
$
(2.43
)
 
$
2.34

 
$
1.04


(1) The number of common stock equivalents is calculated using the treasury stock method and the average market price during the period.