Note 11 - Stock-based Compensation - RSU Activity (Details) - Restricted Stock Units (RSUs) [Member]	9 Months Ended
	Sep. 30, 2023 $ / shares shares
Beginning of period, Restricted stock units, Unvested (in shares) | shares	8,483,491
Beginning of period, Restricted stock units, Unvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 1.04
Restricted stock units, Granted (in shares) | shares	8,482,315
Restricted stock units, Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 0.71
Restricted stock units, Vested (in shares) | shares	(3,623,411)
Restricted stock units, Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 1.14
Restricted stock units, Forfeited (in shares) | shares	(539,448)
Restricted stock units, Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares	$ 0.76
Beginning of period, Restricted stock units, Unvested (in shares) | shares	12,802,947
Beginning of period, Restricted stock units, Unvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 0.82