Note 9 - Loss Per Share - Antidilutive Securities Excluded from the Diluted Calculations (Details) - shares	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Share-Based Payment Arrangement, Option [Member]
Antidilutive Securities (in shares) (in shares)	48,225	51,082
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities (in shares) (in shares)	0	24,167
Warrant [Member]
Antidilutive Securities (in shares) (in shares)	1,807,020	1,819,927
Series B Convertible Preferred Stock [Member]
Antidilutive Securities (in shares) (in shares)	16	16