7. Earnings (Loss) Per Share	9 Months Ended
Sep. 30, 2018
Earnings Loss Per Share
Earnings (Loss) Per Share	Basic earnings (loss) per share is calculated by dividing net income (loss) attributable to common stockholders by the weighted-average number of common shares, except for periods with a loss from operations. Diluted earnings (loss) per share reflects additional common shares that would have been outstanding if dilutive potential shares of common stock had been issued. Potential shares of common stock that may be issued by the Company include shares of common stock that may be issued upon exercise of outstanding stock options. Under the treasury stock method, the unexercised options are assumed to be exercised at the beginning of the period or at issuance, if later. The assumed proceeds are then used to purchase shares of common stock at the average market price during the period. Diluted earnings per common share for the three-month period ended September 30, 2018 was $0.02, and includes the dilutive effects of 724,958 common share equivalents. Diluted earnings per common share for the three-month period ended September 30, 2017 was $0.02 and includes the effects of 1,466,089 common share equivalents. Diluted earnings per common share for the nine-month period ended September 30, 2018 was $0.05, and includes the dilutive effects of 724,958 common share equivalents. Diluted loss per common share for the nine-month period ended September 30, 2017 excludes the effects of 1,466,089 common share equivalents, since such inclusion would be anti-dilutive. The common share equivalents consist of common shares issuable upon exercise of outstanding stock options.

7. Earnings (Loss) Per Share

9 Months Ended

Sep. 30, 2018

Basic earnings (loss) per share is calculated by dividing net income (loss) attributable to common stockholders by the weighted-average number of common shares, except for periods with a loss from operations. Diluted earnings (loss) per share reflects additional common shares that would have been outstanding if dilutive potential shares of common stock had been issued. Potential shares of common stock that may be issued by the Company include shares of common stock that may be issued upon exercise of outstanding stock options. Under the treasury stock method, the unexercised options are assumed to be exercised at the beginning of the period or at issuance, if later. The assumed proceeds are then used to purchase shares of common stock at the average market price during the period.

Diluted earnings per common share for the three-month period ended September 30, 2018 was $0.02, and includes the dilutive effects of 724,958 common share equivalents. Diluted earnings per common share for the three-month period ended September 30, 2017 was $0.02 and includes the effects of 1,466,089 common share equivalents. Diluted earnings per common share for the nine-month period ended September 30, 2018 was $0.05, and includes the dilutive effects of 724,958 common share equivalents. Diluted loss per common share for the nine-month period ended September 30, 2017 excludes the effects of 1,466,089 common share equivalents, since such inclusion would be anti-dilutive. The common share equivalents consist of common shares issuable upon exercise of outstanding stock options.