Note 9 - Stock-Based Compensation - Schedule of Stock Options (Details) - $ / shares shares in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Outstanding, shares (in shares)	30
Outstanding, weighted average exercise price (in dollars per share)	$ 5.96
Outstanding, weighted average remaining contractual term (Year)	8 years 7 months 6 days	8 years
Granted, shares (in shares)	13
Granted, weighted average exercise price (in dollars per share)	$ 0.69
Expired, shares (in shares)	(1)
Expired, weighted average exercise price (in dollars per share)	$ 23.1
Outstanding, shares (in shares)	42	30
Outstanding, weighted average exercise price (in dollars per share)	$ 3.89	$ 5.96
Vested and expected to vest, shares (in shares)	42
Vested and expected to vest, weighted average exercise price (in dollars per share)	$ 3.89
Vested and expected to vest, weighted average remaining contractual term (Year)	8 years 7 months 6 days
Exercisable, shares (in shares)	29
Exercisable, weighted average exercise price (in dollars per share)	$ 5.26
Exercisable, weighted average remaining contractual term (Year)	8 years