Note 15 - Stock Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Outstanding, shares (in shares)	13,906
Outstanding, weighted average exercise price per share (in dollars per share)	$ 2.35
Outstanding, aggregate intrinsic value	$ 44	$ 0
Granted (in shares)	2,461
Granted, weighted average exercise price per share (in dollars per share)	$ 0.72
Exercised (in shares)	0
Exercised, weighted average exercise price per share (in dollars per share)	$ 0
Forfeited (in shares)	0
Forfeited, weighted average exercise price per share (in dollars per share)	$ 0
Expired (in shares)	(3)
Expired, weighted average exercise price per share (in dollars per share)	$ 793.83
Outstanding, shares (in shares)	16,364
Outstanding, weighted average exercise price per share (in dollars per share)	$ 1.95
Outstanding, weighted average contractual life remaining in years (Year)	7 years 11 months 4 days
Exercisable, shares (in shares)	11,227
Exercisable, Weighted average exercise price per share (in dollars per share)	$ 2.32
Exercisable, weighted average contractual life remaining in years (Year)	7 years 3 months 10 days
Vested and expected to vest, shares (in shares)	11,227
Vested and expected to vest, Weighted average exercise price per share (in dollars per share)	$ 1.95
Vested and expected to vest, weighted average contractual life remaining in years (Year)	7 years 11 months 4 days
Vested and expected to vest, aggregate intrinsic value	$ 44