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, 2021	Dec. 31, 2020
Balance, shares (in shares)	45	179
Balance, weighted average exercise price (in dollars per share)	$ 14.20	$ 15.27
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)	(16)	(134)
Options canceled/forfeited, weighted average exercise price (in dollars per share)	$ 14.20	$ 14.36
Options exercised, shares (in shares)	0	(0)
Balance, shares (in shares)	29	45
Balance, weighted average exercise price (in dollars per share)	$ 14.20	$ 14.20
Balance, weighted average remaining contractual life (Year)	1 year 10 months 6 days
Balance, aggregative intrinsic value	$ 0
Options exercisable, shares (in shares)	19
Options exercisable , weighted average exercise price (in dollars per share)	$ 14.06
Options exercisable, weighted average remaining contractual life (Year)	2 years 5 months 4 days
Options exercisable, aggregative intrinsic value	$ 0
Shares available for future grant, shares (in shares)	2,374