Note 11 - Net Loss Per Share - Antidilutive Securities (Details) - shares	3 Months Ended	12 Months Ended
Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Antidilutive Securities (in shares)	10,996,963	3,460,787	8,568,375	3,550,141
Share-Based Payment Arrangement, Option [Member]
Antidilutive Securities (in shares)	5,172,649	3,447,426
Warrant [Member]
Antidilutive Securities (in shares)	5,824,314	13,361	3,728,821	13,361

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