Note 13 - Basic and Diluted Net Loss Per Share - Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares)	24,562,178	16,218,148
Share-Based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares)	10,602,414	7,112,573
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)	12,938,688	7,985,275