Note 11 - Stock-based Compensation - Restricted Stock Activity (Details) - Restricted Stock [Member]	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Nonvested (in shares) | shares	4,223,023
Nonvested, weighted average grant-date fair value (in dollars per share) | $ / shares	$ 4.85
Granted (in shares) | shares	13,138,725
Granted, weighted average grant-date fair value (in dollars per share) | $ / shares	$ 0.5
Vested (in shares) | shares	(3,180,053)
Vested, weighted average grant-date fair value (in dollars per share) | $ / shares	$ 3.07
Forfeited (in shares) | shares	(4,093,643)
Forfeited, weighted average grant-date fair value (in dollars per share) | $ / shares	$ 2.21
Nonvested (in shares) | shares	10,088,052
Nonvested, weighted average grant-date fair value (in dollars per share) | $ / shares	$ 0.81