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Note 13 - Stock-based Compensation - Summary of Option Activity (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Granted, shares (in shares) 200,458      
Granted, weighted average exercise price (in dollars per share) $ 14.02      
Forfeited, shares (in shares) (232,500)      
Forfeited, weighted average exercise period (in dollars per share) $ 10.84      
Lindblad Plan and 2015 Plan [Member]        
Options outstanding, shares (in shares) 1,498,000 510,000 200,000  
Options outstanding, weighted average exercise price (in dollars per share) $ 14.37 $ 10.30 $ 9.47  
Options outstanding, weighted average contractual ife (Year) 7 years 10 months 24 days 8 years 9 months 18 days 6 years 8 months 12 days 7 years 7 months 6 days
Options outstanding, aggregate intrinsic value   $ 1,848,040 $ 3,476,800 $ 1,376,000
Granted, shares (in shares)   1,000,000 310,000  
Granted, weighted average exercise price (in dollars per share)   $ 16.38 $ 10.84  
Exercised, shares (in shares) (77,500) (12,000)    
Exercised, weighted average exercise price (in dollars per share) $ 10.84 $ 9.47    
Options outstanding, shares (in shares) 1,388,458 1,498,000 510,000 200,000
Options outstanding, weighted average exercise price (in dollars per share) $ 15.10 $ 14.37 $ 10.30 $ 9.47
Options vested and/or expected to vest, number of options (in shares) 1,388,458      
Options vested and/or expected to vest, weighted average exercise price (in dollars per share) $ 15.10      
Options vested and/or expected to vest, weighted average contractual life (Year) 7 years 10 months 24 days      
Options vested and/or expected to vest, aggregate intrinsic value $ 0      
Options exercisable, number of options (in shares) 388,000      
Options exercisable, weighted average exercise price (in dollars per share) $ 13.03      
Options exercisable, weighted average contractual life (Year) 6 years 1 month 6 days      
Options exercisable, aggregate intrinsic value $ 0