Note 15 - Stock-based Compensation - Schedule of Stock Option Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Share-Based Payment Arrangement, Option [Member]
Options, Outstanding (in shares)	21,465
Options, outstanding, weighted average exercise price (in dollars per share)	$ 64.71
Options, outstanding, weighted average remaining life (Year)	8 years 4 months 17 days	6 years 4 months 17 days
Options, outstanding, aggregate intrinsic value	$ 0	$ 0
Options exercised (in shares)	0
Options exercised, weighted average exercise price (in dollars per share)	$ 0
Options granted (in shares)	66,000
Options granted, weighted average exercise price (in dollars per share)	$ 4.08
Cancelled/forfeited (in shares)	(16,860)
Cancelled/forfeited, weighted average exercise price (in dollars per share)	$ 4.49
Options, outstanding (in shares)	70,605	21,465
Options, outstanding, weighted average exercise price (in dollars per share)	$ 20.88	$ 64.71
Options, outstanding, vested and expected to vest (in shares)	70,605
Options, outstanding, vested and expected to vest, weighted average exercise price (in dollars per share)	$ 20.88
Options, outstanding, vested and expected to vest, weighted average remaining life (Year)	8 years 4 months 17 days
Options, outstanding, vested and expected to vest, aggregate intrinsic value	$ 0
Options, exercisable, vested and expected to vest (in shares)	18,352
Options, exercisable, vested and expected to vest, weighted average exercise price (in dollars per share)	$ 68.64
Options, exercisable, vested and expected to vest, weighted average remaining life (Year)	5 years 11 months 15 days
Options, exercisable, vested and expected to vest, aggregate intrinsic value	$ 0
Non-plan Options [Member]
Options, Outstanding (in shares)	0
Options, outstanding, weighted average exercise price (in dollars per share)	$ 0
Options, outstanding, weighted average remaining life (Year)	9 years 3 months 29 days
Options, outstanding, aggregate intrinsic value	$ 0	$ 0
Options exercised (in shares)	0
Options exercised, weighted average exercise price (in dollars per share)	$ 0
Options granted (in shares)	25,000
Options granted, weighted average exercise price (in dollars per share)	$ 5.32
Cancelled/forfeited (in shares)	0
Cancelled/forfeited, weighted average exercise price (in dollars per share)	$ 0
Options, outstanding (in shares)	25,000	0
Options, outstanding, weighted average exercise price (in dollars per share)	$ 5.32	$ 0
Options, outstanding, vested and expected to vest (in shares)	25,000
Options, outstanding, vested and expected to vest, weighted average exercise price (in dollars per share)	$ 5.32
Options, outstanding, vested and expected to vest, weighted average remaining life (Year)	9 years 3 months 29 days
Options, outstanding, vested and expected to vest, aggregate intrinsic value	$ 0
Options, exercisable, vested and expected to vest (in shares)	0
Options, exercisable, vested and expected to vest, weighted average exercise price (in dollars per share)	$ 0
Options, exercisable, vested and expected to vest, aggregate intrinsic value	$ 0