Note 8 - Stock-based Compensation - Summary of RSU Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($) $ / shares shares
Vested | $	$ 0
Unvested, June 30, 2024 (in shares) | shares	3,666
Unvested, June 30, 2024 (in dollars per share) | $ / shares	$ 2.61
Unvested, June 30, 2024 | $	$ 9,565
Restricted Stock Units (RSUs) [Member]
Unvested, December 31, 2023 (in shares) | shares	1,500
Unvested, December 31, 2023 (in dollars per share) | $ / shares	$ 3.89
Unvested, December 31, 2023 | $	$ 5,835
Granted (in shares) | shares	2,391
Granted (in dollars per share) | $ / shares	$ 1.93
Granted | $	$ 4,615
Vested (in shares) | shares	225
Vested (in dollars per share) | $ / shares	$ 3.93
Vested | $	$ 884
Forfeited or canceled (in shares) | shares	0
Forfeited or canceled (in dollars per share) | $ / shares	$ 0