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Earnings Per Share
 3 Months Ended
Dec. 31, 2011
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share
 
Basic earnings per share (EPS) is computed by dividing net income by the weighted average number of common shares outstanding for the period. Diluted EPS is computed similarly to basic EPS 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. In the case of a net loss, diluted earnings per share is calculated in the same manner as basic EPS.
 
For the three months ended December 31, 2011, options for 370,000 shares and135,000 restricted stock awards are excluded from the diluted EPS calculations because they are anti-dilutive. For the three months ended December 31, 2010, options for 139,000 shares and no restricted stock award shares were excluded from the diluted EPS calculations because they were anti-dilutive.
 
 
Three Months Ended December 31,
 
2011
 
2010
 
(in thousands, except per share amounts)
Basic Earnings (Loss) Per Share Computation
 
 
 
Net income (loss) attributable to Amtech Systems, Inc.
$
(876
)
 
$
4,992

Weighted Average Shares Outstanding:
 
 
 
Common stock
9,446

 
9,278

Basic earnings (loss) per share attributable to Amtech shareholders
$
(0.09
)
 
$
0.54

Diluted Earnings (Loss) Per Share Computation
 
 
 
Net income (loss) attributable to Amtech Systems, Inc.
$
(876
)
 
$
4,992

Weighted Average Shares Outstanding:
 
 
 
Common stock
9,446

 
9,278

Common stock equivalents (1)
—

 
331

Diluted shares
9,446

 
9,609

Diluted earnings (loss) per share attributable to Amtech shareholders
$
(0.09
)
 
$
0.52


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