Note 2 - Summary of Significant Accounting Policies - Antidilutive Securities Excluded From Computation of Earnings Per Share (Details) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Total potential dilutive securities (in shares)	8,114,367	8,423,978
Share-Based Payment Arrangement, Option [Member]
Total potential dilutive securities (in shares)	390,684	1,013,962
Restricted Stock Units (RSUs) [Member]
Total potential dilutive securities (in shares)	7,471,648	7,403,644
Warrant [Member]
Total potential dilutive securities (in shares)	252,035	6,372