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Note 13 - Stock-based Compensation - Summary of Option Activity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Exercised, shares (in shares) (263,000) 0 (77,500)
Lindblad Plan and 2015 Plan [Member]      
Options outstanding, shares (in shares) 888,458    
Options outstanding, weighted average exercise price (in dollars per share) $ 10.55    
Options outstanding, weighted average contractual ife (Year) 9 years 7 years 8 months 12 days  
Granted, shares (in shares) 1,944,319    
Granted, weighted average exercise price (in dollars per share) $ 8.12    
Exercised, shares (in shares) (263,000)    
Exercised, weighted average exercise price (in dollars per share) $ 9.5    
Forfeited, shares (in shares) (150,000)    
Forfeited, weighted average exercise period (in dollars per share) $ 9.56    
Options outstanding, shares (in shares) 2,419,777 888,458  
Options outstanding, weighted average exercise price (in dollars per share) $ 8.77 $ 10.55  
Options vested and/or expected to vest, number of options (in shares) 2,419,777    
Options vested and/or expected to vest, weighted average exercise price (in dollars per share) $ 8.77    
Options vested and/or expected to vest, weighted average contractual life (Year) 9 years    
Options vested and/or expected to vest, aggregate intrinsic value $ 7,910,071    
Options exercisable, number of options (in shares) 1,594,548    
Options exercisable, weighted average exercise price (in dollars per share) $ 8.76    
Options exercisable, weighted average contractual life (Year) 9 years 1 month 6 days    
Options exercisable, aggregate intrinsic value $ 5,162,571