Note 1 - Organization and Summary of Significant Accounting Policies - Schedule of Potentially Dilutive Securities (Details) - shares	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Potentially dilutive securities excluded from calculation (in shares)	13,484,492	16,337,769
Unvested Restricted Stock [Member]
Potentially dilutive securities excluded from calculation (in shares)	8,454,545	10,901,797
Share-Based Payment Arrangement, Option [Member]
Potentially dilutive securities excluded from calculation (in shares)	4,697,029	5,153,737
Warrant [Member]
Potentially dilutive securities excluded from calculation (in shares)	312,272	262,100
Convertible Debt Securities [Member]
Potentially dilutive securities excluded from calculation (in shares)	20,646	20,135