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Per Share Amounts (Tables)
 6 Months Ended
Jun. 30, 2016
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 six month periods ended June 30, 2016 and 2015:
 
 
 
Three months ended June 30,
 
Six months ended June 30,
 
 
 
2016
 
2015
 
2016
 
2015
 
Net income (loss) attributable to American Shared Hospital Services
 
$
93,000
 
$
(1,970,000)
 
$
144,000
 
$
(1,842,000)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average common shares for basic earnings per share
 
 
5,552,000
 
 
5,484,000
 
 
5,548,000
 
 
5,480,000
 
Diluted effect of stock options and restricted stock
 
 
16,000
 
 
-
 
 
16,000
 
 
-
 
Weighted average common shares for diluted earnings per share
 
 
5,568,000
 
 
5,484,000
 
 
5,564,000
 
 
5,480,000
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic earnings (loss) per share
 
$
0.02
 
$
(0.36)
 
$
0.03
 
$
(0.34)
 
Diluted earnings (loss) per share
 
$
0.02
 
$
(0.36)
 
$
0.03
 
$
(0.34)