Note 18 - Basic and Diluted Net Loss per Share - Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares)	9,599,990	53,819,880	4,346,057
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares)	4,640,660	4,361,872	1,830,958
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares)	1,120,300	46,498,909	2,071,172
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares)	3,839,030	2,959,099	443,927