Note 9 - Basic and Diluted Net Loss Per Share

3 Months Ended

Mar. 31, 2021

Notes to Financial Statements

Earnings Per Share [Text Block]

9. Basic and Diluted Net Loss per Share

Basic net loss per common share is computed by dividing net loss attributable to common stockholders by the weighted average number of common shares outstanding during the period. Diluted net loss per common share is computed giving effect to all potential dilutive common shares that were outstanding during the period when the effect is dilutive. Potential dilutive common shares consist of incremental shares issuable upon exercise of stock options, restricted stock units, warrants and preferred stock. For the three months ended  March 31, 2020, the effects of the Series A Preferred Stock beneficial conversion charge and conversion are included in the calculation of net loss attributable to common stockholders. No adjustments have been made to the weighted average outstanding common shares figures for the three months ended March 31, 2021 or 2020 as the assumed exercise of outstanding options, warrants and restricted stock units would be anti-dilutive.

Potential common shares not included in calculating diluted net loss per share are as follows:

	March 31,
	2021		2020
Stock options		4,731,249		4,361,872
Stock warrants		1,323,995		46,498,909
Nonvested restricted stock units		2,688,342		2,959,099
Total		8,743,586		53,819,880