Note 9 - Stock-based Compensation - Schedule of Option Activity (Details) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Balance, options (in shares)	13,051
Balance, options, weighted average exercise price (in dollars per share)	$ 109.62
Balance, options, remaining contractual term (Year)	2 years 8 months 8 days	2 years 6 months 18 days
Options granted (in shares)	0
Options granted, weighted average exercise price (in dollars per share)	$ 0
Options exercised (in shares)	0
Options exercised, weighted average exercise price (in dollars per share)	$ 0
Options canceled (in shares)	(1,764)
Options canceled, weighted average exercise price (in dollars per share)	$ 120
Balance, options (in shares)	11,287	13,051
Balance, options, weighted average exercise price (in dollars per share)	$ 108	$ 109.62
Exercisable, options3 (in shares)	11,287
Exercisable, options, weighted average exercise price (in dollars per share)	$ 108
Exercisable, options, remaining contractual term (Year)	2 years 8 months 8 days
Vested and expected to vest, options (in shares)	11,287
Vested and expected to vest, options, , weighted average exercise price (in dollars per share)	$ 108
Vested and expected to vest, options, remaining contractual term (Year)	2 years 8 months 8 days