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Per Share Amounts (Tables)
 9 Months Ended
Sep. 30, 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 and nine-month periods ended September 30, 2017 and 2016:
 
 
 
Three Months ended September 30,
 
Nine Months ended September 30,
 
 
 
2017
 
2016
 
2017
 
2016
 
Net income attributable to American Shared Hospital Services
 
$
99,000
 
$
334,000
 
$
505,000
 
$
478,000
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average common shares for basic earnings per share
 
 
5,947,000
 
 
5,554,000
 
 
5,745,000
 
 
5,553,000
 
Diluted effect of stock options and restricted stock
 
 
94,000
 
 
39,000
 
 
167,000
 
 
11,000
 
Weighted average common shares for diluted earnings per share
 
 
6,041,000
 
 
5,593,000
 
 
5,912,000
 
 
5,564,000
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic earnings per share
 
$
0.02
 
$
0.06
 
$
0.09
 
$
0.09
 
Diluted earnings per share
 
$
0.02
 
$
0.06
 
$
0.09
 
$
0.09