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Per Share Amounts (Tables)
 3 Months Ended
Mar. 31, 2018
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, 2018 and 2017:
 
 
 
Three Months ended March 31,
 
 
 
2018
 
2017
 
Net income attributable to American Shared Hospital Services
 
$
390,000
 
$
293,000
 
 
 
 
 
 
 
 
 
Weighted average common shares for basic earnings per share
 
 
5,818,000
 
 
5,685,000
 
Diluted effect of stock options and restricted stock
 
 
37,000
 
 
199,000
 
Weighted average common shares for diluted earnings per share
 
 
5,855,000
 
 
5,884,000
 
 
 
 
 
 
 
 
 
Basic earnings per share
 
$
0.07
 
$
0.05
 
Diluted earnings per share
 
$
0.07
 
$
0.05