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Note 2 - Significant Accounting Policies - Antidilutive Securities (Details) - shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Antidilutive securities (in shares)	17,770,004	17,098,388
Common Stock Warrants [Member]
Antidilutive securities (in shares)	2,000,000	2,000,000
Placement Agent Warrants [Member]
Antidilutive securities (in shares)	80,000	80,000
Series A Warrants [Member]
Antidilutive securities (in shares)	14,450,069	14,450,069
Unvested Common Stock Grants [Member]
Antidilutive securities (in shares)	1,239,935	568,319

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482662/260-10-50-1

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