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Per Share Amounts
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]
Note 5.
Per Share Amounts
 
Per share information has been computed based on the weighted average number of common shares and dilutive common share equivalents outstanding. The computation for the three and nine-month periods ended September 30, 2018 excluded approximately 176,000 and 519,000 stock options, respectively, because the exercise price of the options was higher than the average market price during those periods. The computation for the three and nine-month periods ended September 30, 2017 excluded approximately 14,000 stock options, because the exercise price of the options or warrants was higher than the average market price during those periods.
 
Based on the guidance provided in accordance with ASC 260
Earnings Per Share
(“ASC 260”), the weighted average common shares for basic earnings per share, for the three and nine-month periods ended September 30, 2018 and 2017, excluded the weighted average impact of the unvested performance share awards, discussed below. These awards are legally outstanding but are not deemed participating securities and therefore are excluded from the calculation of basic earnings per share. The unvested shares are also excluded from the denominator for diluted earnings per share because they are considered contingent shares not deemed probable for the three and nine-month periods ended September 30, 2018 and 2017.
 
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