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Note 19 - Stockholders' Equity - Summary of Stock Option Activity (Details) - Time Based Option [Member] - USD ($)
 12 Months Ended
May 31, 2024
May 31, 2023
E I P Original Plan [Member]    
Balance, options (in shares) 2,809,198  
Balance, weighted average exercise price (in dollars per share) $ 14.88  
Balance, contractual term (Year) 4 years 5 years
Balance, aggregate intrinsic value $ 0 $ 0
Granted, options (in shares) 0  
Granted, weighted average exercise price (in dollars per share) $ 0  
Exercised, options (in shares) 0  
Exercised, weighted average exercise price (in dollars per share) $ 0  
Forfeited, options (in shares) 0  
Forfeited, weighted average exercise price (in dollars per share) $ 0  
Cancelled, options (in shares) (11,411)  
Expired, weighted average exercise price (in dollars per share) $ 101.8  
Balance, options (in shares) 2,797,787 2,809,198
Balance, weighted average exercise price (in dollars per share) $ 14.53 $ 14.88
Original Plan [Member]    
Balance, options (in shares) 63,969  
Balance, weighted average exercise price (in dollars per share) $ 3.52  
Balance, contractual term (Year) 3 years 3 years 9 months 18 days
Balance, aggregate intrinsic value $ 1,430 $ 7,680
Exercised, options (in shares) (4,291)  
Exercised, weighted average exercise price (in dollars per share) $ 0.19  
Forfeited, options (in shares) 0  
Forfeited, weighted average exercise price (in dollars per share) $ 0  
Expired, weighted average exercise price (in dollars per share) $ 5.16  
Balance, options (in shares) 49,166 63,969
Balance, weighted average exercise price (in dollars per share) $ 3.46 $ 3.52
Expired, options (in shares) (10,512)