Note 1 - Organization and Summary of Significant Accounting Policies - Schedule of Potentially Dilutive Securities (Details) - shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Potentially dilutive securities excluded from calculation (in shares)	14,926,416	14,209,749
Unvested Restricted Stock [Member]
Potentially dilutive securities excluded from calculation (in shares)	9,898,448	9,000,857
Share-Based Payment Arrangement, Option [Member]
Potentially dilutive securities excluded from calculation (in shares)	4,694,529	4,876,484
Warrant [Member]
Potentially dilutive securities excluded from calculation (in shares)	312,272	312,272
Convertible Debt Securities [Member]
Potentially dilutive securities excluded from calculation (in shares)	21,167	20,136