Note 3 - Basis of Presentation and Summary of Significant Accounting Policies - Outstanding Dilutive Securities (Details) - shares	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Antidilutive securities (in shares)	195,209	233,637
Warrant [Member]
Antidilutive securities (in shares)	88,252	111,891
Share-Based Payment Arrangement, Option [Member]
Antidilutive securities (in shares)	104,047	116,564
Unvested Restricted Stock Units [Member]
Antidilutive securities (in shares)	2,910	5,182

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.

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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration