Note 10 - Net Loss per Share - Antidilutive Securities (Details) - shares	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Antidilutive securities (in shares)	1,651,121	706,145
Warrant [Member]
Antidilutive securities (in shares)	1,078,943	634,509
Share-Based Payment Arrangement, Option [Member]
Antidilutive securities (in shares)	164,355	5,026
Series B Convertible Preferred Stock [Member]
Antidilutive securities (in shares)	335,213	0
Series X Preferred Stock [Member]
Antidilutive securities (in shares)	66,610	66,610
Restricted Stock Units (RSUs) [Member]
Antidilutive securities (in shares)	6,000	0