Note 9 - Stock-based Compensation - Summary of RSU Activity (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Unvested, shares (in shares)	1,200	0
Unvested, fair value per share (in dollars per share)	$ 3.83	$ 0
Granted, shares (in shares)	0	1,200
Granted, fair value per share (in dollars per share)	$ 0	$ 3.83
Granted, weighted average fair value		$ 4,596
Vested, shares (in shares)	(300)	0
Vested, fair value per share (in dollars per share)	$ 3.83	$ 0
Forfeited or canceled, shares (in shares)	0	0
Forfeited or canceled, fair value per share (in dollars per share)	$ 0	$ 0
Unvested, weighted average fair value	$ 3,447	$ 4,596
Vested, weighted average fair value	$ (1,149)
Unvested, shares (in shares)	900	1,200
Unvested, fair value per share (in dollars per share)	$ 3.83	$ 3.83