Note 10 - Stock-based Compensation - RSU Activity (Details) - Restricted Stock Units (RSUs) [Member]	3 Months Ended
	Mar. 31, 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	7,340,630
Restricted stock units, Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 0.73
Restricted stock units, Vested (in shares) | shares	(3,082,354)
Restricted stock units, Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 1.18
Restricted stock units, Forfeited (in shares) | shares	(84,673)
Restricted stock units, Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares	$ 1.13
Unvested (in shares) | shares	12,657,094
Unvested March 31, 2023 (in dollars per share) | $ / shares	$ 0.83