Note 11 - Fair Value Measurements - Fair Value on Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Warrant liability	$ 567,439	$ 372,730
Total	567,439	372,730
Fair Value, Inputs, Level 3 [Member]
Warrant liability	567,439	372,730
Total	$ 567,439	$ 372,730

Fair value of financial and nonfinancial obligations.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

Name:	us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant