Note 12 - Stock-based Compensation - Summary of Option Activity (Details) - Lindblad Plan and 2015 Plan [Member] - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Options outstanding, shares (in shares)	1,388,458
Options outstanding, weighted average exercise price (in dollars per share)	$ 15.1
Options outstanding, weighted average contractual ife (Year)	7 years 8 months 12 days	7 years 10 months 24 days
Granted, shares (in shares)	500,000
Granted, weighted average exercise price (in dollars per share)	$ 9.56
Forfeited, shares (in shares)	(1,000,000)
Forfeited, weighted average exercise period (in dollars per share)	$ 16.38
Options outstanding, shares (in shares)	888,458	1,388,458
Options outstanding, weighted average exercise price (in dollars per share)	$ 10.55	$ 15.1
Options vested and/or expected to vest, number of options (in shares)	888,458
Options vested and/or expected to vest, weighted average exercise price (in dollars per share)	$ 10.55
Options vested and/or expected to vest, weighted average contractual life (Year)	7 years 8 months 12 days
Options vested and/or expected to vest, aggregate intrinsic value	$ 0
Options exercisable, number of options (in shares)	238,115
Options exercisable, weighted average exercise price (in dollars per share)	$ 10.43
Options exercisable, weighted average contractual life (Year)	3 years 10 months 24 days
Options exercisable, aggregate intrinsic value	$ 0