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Per Share Amounts (Tables)
 3 Months Ended
Mar. 31, 2016
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 month periods ended March 31, 2016 and 2015:
 
 
 
Three Months ended March 31,
 
 
 
2016
 
2015
 
Net income attributable to American Shared Hospital Services
 
$
51,000
 
$
128,000
 
 
 
 
 
 
 
 
 
Weighted average common shares for basic earnings per share
 
 
5,541,000
 
 
5,477,000
 
Diluted effect of stock options and restricted stock
 
 
-
 
 
49,000
 
Weighted average common shares for diluted earnings per share
 
 
5,541,000
 
 
5,526,000
 
 
 
 
 
 
 
 
 
Basic earnings per share
 
$
0.01
 
$
0.02
 
Diluted earnings per share
 
$
0.01
 
$
0.02