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Per Share Amounts (Tables)
 3 Months Ended
Mar. 31, 2017
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, 2017 and 2016:
 
 
 
Three Months ended March 31,
 
 
 
2017
 
 
2016
 
Net income attributable to American Shared Hospital Services
 
$
293,000
 
 
$
51,000
 
 
 
 
 
 
 
 
 
 
Weighted average common shares for basic earnings per share
 
 
5,685,000
 
 
 
5,541,000
 
Diluted effect of stock options and restricted stock
 
 
199,000
 
 
 
-
 
Weighted average common shares for diluted earnings per share
 
 
5,884,000
 
 
 
5,541,000
 
 
 
 
 
 
 
 
 
 
Basic earnings per share
 
$
0.05
 
 
$
0.01
 
Diluted earnings per share
 
$
0.05
 
 
$
0.01