Note 11 - Loss Per Share - Antidilutive Securities Excluded from the Diluted Calculations (Details) - shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Share-Based Payment Arrangement, Option [Member]
Antidilutive Securities (in shares) (in shares)	47,501	47,805
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities (in shares) (in shares)	0	2,500
Warrant [Member]
Antidilutive Securities (in shares) (in shares)	1,799,430	1,812,379
Series B Convertible Preferred Stock [Member]
Antidilutive Securities (in shares) (in shares)	16	16