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Per Share Amounts (Tables)
 6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table sets forth the computation of basic and diluted earnings per share for the three and six month periods ended June 30, 2015 and 2014:
 
 
 
Three Months ended June 30,
 
Six Months ended June 30,
 
 
 
2015
 
2014
 
2015
 
2014
 
Net (loss) attributable to American Shared Hospital Services
 
$
(1,970,000)
 
$
(927,000)
 
$
(1,842,000)
 
$
(1,023,000)
 
Weighted average common shares for basic earnings per share
 
 
5,484,000
 
 
4,718,000
 
 
5,480,000
 
 
4,718,000
 
Diluted effect of stock options and restricted stock
 
 
-
 
 
-
 
 
-
 
 
-
 
Weighted average common shares for diluted earnings per share
 
 
5,484,000
 
 
4,718,000
 
 
5,480,000
 
 
4,718,000
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic (loss) per share
 
$
(0.36)
 
$
(0.20)
 
$
(0.34)
 
$
(0.22)
 
Diluted (loss) per share
 
$
(0.36)
 
$
(0.20)
 
$
(0.34)
 
$
(0.22)