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Note 1 - Nature of Activities and Summary of Significant Accounting Policies - Schedule of Dilutive Securities (Details) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Total Number of Potentially Dilutive Shares Excluded from the basic and diluted net loss per share calculation (in shares)	6,417	5,167
Series B Convertible Preferred Stock [Member]
Total Number of Potentially Dilutive Shares Excluded from the basic and diluted net loss per share calculation (in shares)	127	128
Common Stock Options and Warrants [Member]
Total Number of Potentially Dilutive Shares Excluded from the basic and diluted net loss per share calculation (in shares)	5,050	3,819
Debt with Conversion Feature [Member]
Total Number of Potentially Dilutive Shares Excluded from the basic and diluted net loss per share calculation (in shares)	1,240	1,220

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

+ Details

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