Note 12 - Stock-based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Options, Outstanding, Number of Shares (in shares)		10,444,679
Options, Outstanding, Weighted Average Exercise Price (in dollars per share)		$ 3.2
Options, Outstanding, Weighted Average Remaining Contractual Term (Year)	5 years 1 month 20 days	4 years 9 months 18 days
Options, Granted, Number of Shares (in shares)	5,552,790
Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	$ 0.26
Options, Cancelled, Number of Shares (in shares)	(110,980)
Options, Expirations in Period, Weighted Average Exercise Price (in dollars per share)	$ 15.61
Options, Outstanding, Number of Shares (in shares)	15,886,489
Options, Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 2.07
Options, Outstanding, Aggregate Intrinsic Value	$ 389
Options, Vested and Expected to Vest, Number of Shares (in shares)	14,894,960
Options, Vested and Expected to Vest, Weighted Average Exercise Price (in dollars per share)	$ 2.18
Options, Vested and Expected to Vest, Weighted Average Remaining Contractual Term (Year)	5 years 21 days
Options, Vested and Expected to Vest, Aggregate Intrinsic Value	$ 334
Options, Exercisable, Number of Shares (in shares)	7,919,713
Options, Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 3.74
Options, Exercisable, Weighted Average Remaining Contractual Term (Year)	4 years 14 days
Options, Exercisable, Aggregate Intrinsic Value	$ 0