Note 7 - Net Loss Per Common Share

3 Months Ended

Mar. 31, 2018

Notes to Financial Statements

Earnings Per Share [Text Block]

7.

Net Loss per Common Share

Basic net loss per common share is calculated by dividing the net loss by the weighted average number of common shares outstanding during the period. Diluted earnings per share is calculated using the weighted average number of common shares outstanding plus dilutive common stock equivalents outstanding during the period. Common stock equivalents are excluded for the

three

month periods ended

March 31, 2018

and

2017,

since the effect is anti-dilutive due to the Company’s net losses attributable to common stockholders. Common stock equivalents include stock options, warrants and unvested restricted stock.

Basic weighted average common shares outstanding, and the potentially dilutive securities excluded from loss per share computations because they are anti-dilutive, are as follows as of

March 31, 2018

and

2017,

respectively:

	Three Month Period Ended March 31,
	2018		2017
Basic and diluted weighted average common stock shares outstanding		14,098,610		12,964,639
Potentially dilutive securities excluded from loss per share computations:
Common stock options		3,326,841		3,387,581
Common stock purchase warrants		6,676,849		7,603,141
Restricted stock unvested		337,981		282,350