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Per Share Amounts (Tables)
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table sets forth the computation of basic and diluted earnings per share for the three and six-month periods ended June 30, 2019 and 2018:
 
 
Three Months ended June 30,
 
Six Months ended June 30,
 
 
2019
 
2018
 
2019
 
2018
Net income attributable to American Shared Hospital Services
 
$
31,000

 
$
287,000

 
$
301,000

 
$
677,000

 
 
 
 
 
 
 
 
 
Weighted average common shares for basic earnings per share
 
5,876,000

 
5,834,000

 
5,862,000

 
5,826,000

Diluted effect of stock options and restricted stock
 
30,000

 
28,000

 
33,000

 
29,000

Weighted average common shares for diluted earnings per share
 
5,906,000

 
5,862,000

 
5,895,000

 
5,855,000

 
 
 
 
 
 
 
 
 
Basic earnings per share
 
$
0.01

 
$
0.05

 
$
0.05

 
$
0.12

Diluted earnings per share
 
$
0.01

 
$
0.05

 
$
0.05

 
$
0.12