Note 8 - Stock-based Compensation - Schedule of Option Activity (Details) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Balance, options (in shares)	13,051
Balance, options, weighted average exercise price (in dollars per share)	$ 109.62
Balance, options, remaining contractual term (Year)	3 years 9 months 3 days	4 years
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)	0
Options canceled, weighted average exercise price (in dollars per share)	$ 0
Balance, options (in shares)	13,051	13,051
Balance, options, weighted average exercise price (in dollars per share)	$ 109.62	$ 109.62
Exercisable, options3 (in shares)	13,051
Exercisable, options, weighted average exercise price (in dollars per share)	$ 109.62
Exercisable, options, remaining contractual term (Year)	3 years 9 months 3 days
Vested and expected to vest, options (in shares)	13,051
Vested and expected to vest, options, , weighted average exercise price (in dollars per share)	$ 109.62
Vested and expected to vest, options, remaining contractual term (Year)	3 years 9 months 3 days