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Per Share Amounts (Tables)
 9 Months Ended
Sep. 30, 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 and nine-month periods ended September 30, 2018 and 2017:
 
 
 
Three Months ended

September 30,
 
 
Nine Months ended

September 30,
 
 
 
2018
 
 
2017
 
 
2018
 
 
2017
 
Net income attributable to American Shared Hospital Services
 
$
168,000
 
 
$
99,000
 
 
$
845,000
 
 
$
505,000
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average common shares for basic earnings per share
 
 
5,841,000
 
 
 
5,947,000
 
 
 
5,831,000
 
 
 
5,745,000
 
Diluted effect of stock options and restricted stock
 
 
50,000
 
 
 
94,000
 
 
 
24,000
 
 
 
167,000
 
Weighted average common shares for diluted earnings per share
 
 
5,891,000
 
 
 
6,041,000
 
 
 
5,855,000
 
 
 
5,912,000
 
Basic earnings per share
 
$
0.03
 
 
$
0.02
 
 
$
0.14
 
 
$
0.09
 
Diluted earnings per share
 
$
0.03
 
 
$
0.02
 
 
$
0.14
 
 
$
0.09