Note 15 - Basic and Diluted Net Loss Per Share - Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares)	17,089,534	9,599,990
Share-Based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares)	7,584,967	4,640,660
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares)	1,021,076	1,120,300
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares)	8,483,491	3,839,030