Note 3 - Net Loss Per Share - Antidilutive Securities (Details) (Parentheticals) - $ / shares	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024
Class of Warrant or Right, Outstanding (in shares)	81,645,868	47,751,368
Warrant [Member]
Class of Warrant or Right, Outstanding (in shares)	1,968,765		1,968,765
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.0001		$ 0.0001

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 3: 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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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant