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Note 5 - Stockholders' Equity - Schedule of Warrants (Details)	Jun. 30, 2022 $ / shares shares
Number of shares (in shares)	23,405,329
Warrants 2020 [Member]
Number of shares (in shares)	120,000
Exercise price (in dollars per share) | $ / shares	$ 1.65
Unit Warrants 2020 [Member]
Number of shares (in shares)	2,396,631
Exercise price (in dollars per share) | $ / shares	$ 5.00
Representative Warrants 2020 [Member]
Number of shares (in shares)	128,000
Exercise price (in dollars per share) | $ / shares	$ 5.50
Representative Warrants 2021 [Member]
Number of shares (in shares)	72,000
Exercise price (in dollars per share) | $ / shares	$ 6.875
Warrants 2021 [Member]
Number of shares (in shares)	100,000
Exercise price (in dollars per share) | $ / shares	$ 13.00
January 2022 Common Warrants [Member]
Number of shares (in shares)	3,067,484
Exercise price (in dollars per share) | $ / shares	$ 3.26
May 2022 Pre-Funded Warrants [Member]
Number of shares (in shares)	5,400,000
Exercise price (in dollars per share) | $ / shares	$ 0.001
May 2022 Preferred Investment Options 1 [Member]
Number of shares (in shares)	9,090,910
Exercise price (in dollars per share) | $ / shares	$ 1.65
May 2022 Preferred Investment Options 2 [Member]
Number of shares (in shares)	3,030,304
Exercise price (in dollars per share) | $ / shares	$ 1.65

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644

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- Definition

Number of warrants or rights outstanding.

+ References

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