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Note 7 - Stockholders' Equity and Common Stock Warrants - Warrants Outstanding to Acquire Shares of Its Common Stock (Details)	Jun. 30, 2023 $ / shares shares
Common stock warrants issued (in shares) | shares	88,252
Warrants Issued in Connection with May 2019 Public Offering [Member]
Common stock warrants issued (in shares) | shares	27,648
Warrants Issued in Connection with May 2019 Public Offering [Member] | Minimum [Member]
Common stock warrants issued, exercise price (in dollars per share)	$ 250.09
Warrants Issued in Connection with May 2019 Public Offering [Member] | Maximum [Member]
Common stock warrants issued, exercise price (in dollars per share)	$ 306.04
Warrants Issued in Connection with the November 2019 Offering [Member]
Common stock warrants issued (in shares) | shares	4,269
Common stock warrants issued, exercise price (in dollars per share)	$ 17.51
Warrants Issued in Connection with the December 2019 Offering [Member]
Common stock warrants issued (in shares) | shares	6,264
Warrants Issued in Connection with the December 2019 Offering [Member] | Minimum [Member]
Common stock warrants issued, exercise price (in dollars per share)	$ 21.68
Warrants Issued in Connection with the December 2019 Offering [Member] | Maximum [Member]
Common stock warrants issued, exercise price (in dollars per share)	$ 34.92
The May 2020 Offering Warrants [Member]
Common stock warrants issued (in shares) | shares	11,424
Common stock warrants issued, exercise price (in dollars per share)	$ 65.65
The May 2020 Investor Warrant Exercise [Member]
Common stock warrants issued (in shares) | shares	4,998
Common stock warrants issued, exercise price (in dollars per share)	$ 29.7
Underwriter Warrants in Connection with the February 2021 Common Stock Offering [Member]
Common stock warrants issued (in shares) | shares	33,649
Common stock warrants issued, exercise price (in dollars per share)	$ 64.08

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-3

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