Note 7 - Stock-based Compensation - Summary of Restricted Common Stock Activity (Details) - $ / shares		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Restricted Stock [Member]
Outstanding, Shares (in shares)		1,467,936	997,745
Outstanding, Weighted average grant date fair value (in dollars per share)		$ 12.17	$ 20.62
Granted, Shares (in shares)	[1]	1,126,296	12,227
Granted, Weighted average grant date fair value (in dollars per share)	[1]	$ 8.1	$ 12.04
Vested, Shares (in shares)		(307,276)	(257,355)
Vested, Weighted average grant date fair value (in dollars per share)		$ 13.78	$ 20.21
Outstanding, Shares (in shares)		2,286,956	752,617
Outstanding, Weighted average grant date fair value (in dollars per share)		$ 9.95	$ 20.62
Restricted Stock [Member] | Common Class A [Member]
Outstanding, Shares (in shares)		1,148,233	677,238
Outstanding, Weighted average grant date fair value (in dollars per share)		$ 12.37	$ 19.36
Granted, Shares (in shares)	[1]	823,393	25,022
Granted, Weighted average grant date fair value (in dollars per share)	[1]	$ 8.25	$ 13.3
Vested, Shares (in shares)		(318,733)	(203,986)
Vested, Weighted average grant date fair value (in dollars per share)		$ 13.17	$ 18.76
Outstanding, Shares (in shares)		1,652,893	498,274
Outstanding, Weighted average grant date fair value (in dollars per share)		$ 10.16	$ 19.3
Restricted Stock Units (RSUs) [Member]
Outstanding, Shares (in shares)		587,168	274,145
Outstanding, Weighted average grant date fair value (in dollars per share)		$ 11.5	$ 23.6
Granted, Shares (in shares)		1,229,390	587,168
Granted, Weighted average grant date fair value (in dollars per share)		$ 5.72	$ 11.5
Vested, Shares (in shares)		(564,793)	(247,953)
Vested, Weighted average grant date fair value (in dollars per share)		$ 11.5	$ 23.64
Forfeited, Shares (in shares)		(22,375)	(26,192)
Forfeited, Weighted average grant date fair value (in dollars per share)		$ 11.5	$ 23.15
Outstanding, Shares (in shares)		1,229,390	587,168
Outstanding, Weighted average grant date fair value (in dollars per share)		$ 5.72	$ 11.5

[1] For awards subject to future performance conditions, amounts assume target performance.