Note 3 - Net Loss Per Share - Antidilutive Securities (Details) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Total potential dilutive shares (in shares)	11,916,299	4,608,611
Share-Based Payment Arrangement, Option [Member]
Total potential dilutive shares (in shares)	981,834	849,600
Performance Shares [Member]
Total potential dilutive shares (in shares)	8,889,221	2,123,443
Restricted Stock [Member]
Total potential dilutive shares (in shares)	0	25,924
Shares Reserved for Convertible Notes [Member]
Total potential dilutive shares (in shares)	983,314	547,714
Warrant [Member]
Total potential dilutive shares (in shares)	1,061,930	1,061,930