Note 2 - Summary of Significant Accounting Policies - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Anti-dilutive securities (in shares)	11,875,942	1,668,919
Stock option [Member]
Anti-dilutive securities (in shares)	2,656,455	802,455
Warrant [Member]
Anti-dilutive securities (in shares)	9,213,008	851,168
Series A Convertible Preferred Stock [Member]
Anti-dilutive securities (in shares)	6,479	6,479
Restricted Stock Units [Member]
Anti-dilutive securities (in shares)	0	8,817