Note 6 - Stock-Based Compensation - Schedule of Stock Options Activity (Details) - Share-Based Payment Arrangement, Option [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Balance, shares (in shares)	18	29
Balance, weighted average exercise price (in dollars per share)	$ 14.05	$ 14.2
Options granted, shares (in shares)	0	0
Options granted, weighted average exercise price (in dollars per share)	$ 0	$ 0
Options exercised, shares (in shares)	0	0
Options exercised, weighted average exercise price (in dollars per share)	$ 0	$ 0
Options canceled/forfeited, shares (in shares)	(10)	(11)
Options canceled/forfeited, weighted average exercise price (in dollars per share)	$ 17.11	$ 14.48
Options exercised, shares (in shares)	0	(0)
Balance, shares (in shares)	8	18
Balance, weighted average exercise price (in dollars per share)	$ 10.37	$ 14.05
Balance, weighted average remaining contractual life (Year)	4 months 20 days
Balance, aggregative intrinsic value	$ 0
Options exercisable, shares (in shares)	8
Options exercisable , weighted average exercise price (in dollars per share)	$ 10.37
Options exercisable, weighted average remaining contractual life (Year)	4 months 20 days
Options exercisable, aggregative intrinsic value	$ 0
Shares available for future grant, shares (in shares)	1,482