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Note 5 - Stockholders' Equity and Common Stock Warrants (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

		Outstanding				Range of exercise price per share			Expiration dates
Common stock warrants issued in 2017 related to Series A convertible preferred stock offering			903,870				$33.30		March 2022
Common stock warrants issued in 2018 related to January 2018 Offering			1,181,421			$12.00	-	$15.00	January 2023
Common stock warrants issued related to the May 2019 Offering			1,382,913			$5.00	-	$6.11875	May and December 2024
Common stock warrants issued related to the November 2019 Offering			267,140				$0.35		May 2021 and November 2024
Common stock warrants issued related to the December 2019 Offering			313,339			$0.4335	-	$0.6981	December 2024 and June 2025
Common stock warrants issued related to the May 2020 Offering			571,429				$1.31		March 2025
Common stock warrants issued related to the May 2020 Investor Warrant Exercise			250,000				$0.5938		November 2025
Common stock warrants issued related to the February 2021 Offering			1,682,927				$1.28		February 2026
			6,553,039

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- Definition

Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775

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- References

No definition available.

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