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