Note 15 - Stock Based Compensation - Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) $ / shares shares
Outstanding, shares (in shares)	10,027
Outstanding, weighted average exercise price per share (in dollars per share) | $ / shares	$ 2.82
Granted (in shares)	4,079
Granted, weighted average exercise price per share (in dollars per share) | $ / shares	$ 1.13
Granted, aggregate intrinsic value | $	$ 51
Forfeited (in shares)	(200)
Forfeited, weighted average exercise price per share (in dollars per share) | $ / shares	$ 0.91
Exercised (in shares)	0
Exercised, aggregate intrinsic value | $
Expired (in shares)	0
Expired, weighted average exercise price per share (in dollars per share) | $ / shares	$ 0
Outstanding, shares (in shares)	13,906
Outstanding, weighted average exercise price per share (in dollars per share) | $ / shares	$ 2.35
Outstanding, weighted average contractual life remaining in years (Year)	7 years 9 months 25 days
Outstanding, aggregate intrinsic value | $
Exercisable, shares (in shares)	10,283
Exercisable, Weighted average exercise price per share (in dollars per share) | $ / shares	$ 2.59
Exercisable, weighted average contractual life remaining in years (Year)	7 years 4 months 28 days
Exercisable, aggregate intrinsic value | $
Vested and expected to vest, shares (in shares)	13,906
Vested and expected to vest, Weighted average exercise price per share (in dollars per share) | $ / shares	$ 2.35
Vested and expected to vest, weighted average contractual life remaining in years (Year)	7 years 9 months 25 days
Vested and expected to vest, aggregate intrinsic value | $