Note 13 - Stock-based Compensation - RSU Activity (Details) - Restricted Stock Units (RSUs) [Member]	12 Months Ended
	Dec. 31, 2022 $ / shares shares
Beginning of period, Restricted stock units, Unvested (in shares) | shares	3,839,030
Beginning of period, Restricted stock units, Unvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 2.36
Restricted stock units, Granted (in shares) | shares	6,996,822
Restricted stock units, Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 0.71
Restricted stock units, Vested (in shares) | shares	(2,076,663)
Restricted stock units, Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 2.34
Restricted stock units, Forfeited (in shares) | shares	(275,698)
Restricted stock units, Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares	$ 1.19
Unvested (in shares) | shares	8,483,491
Unvested December 31, 2022 (in dollars per share) | $ / shares	$ 1.04