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Note 9 - Stock Transactions and Stock-based Compensation - Stock Option and Non-vested Stock Award Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Options outstanding (in shares) 202    
Options outstanding, weighted average exercise price (in dollars per share) $ 167.14    
Outstanding, Weighted- Average Remaining Contractual Life (Year) 3 years 3 months 18 days 2 years 10 months 24 days  
Outstanding, Aggregate Intrinsic Value $ 1,643 $ 18,261  
Options granted (in shares) 43    
Awards granted, weighted average exercise price (in dollars per share) $ 185,600 $ 268.81 $ 226.72
Options forfeited or expired (in shares) (9)    
Awards forfeited or expired, weighted average exercise price (in dollars per share) $ 218,130    
Options exercised or distributed (in shares) (73)    
Awards exercised or distributed, weighted average exercise price (in dollars per share) $ 97,340    
Options outstanding (in shares) 163 202  
Options outstanding, weighted average exercise price (in dollars per share) $ 200.62 $ 167.14  
Options exercisable (in shares) 83    
Exercisable, weighted average exercise price (in dollars per share) $ 193,050.00    
Exercisable, Weighted- Average Remaining Contractual Life (Year) 2 years 3 months 18 days    
Exercisable, Aggregate Intrinsic Value $ 1,405    
Exercisable and expected to vest (in shares) 160    
Exercisable and expected to vest, weighted average exercise price (in dollars per share) $ 200.62    
Exercisable and expected to vest, Weighted- Average Remaining Contractual Life (Year) 3 years 2 months 12 days    
Exercisable and expected to vest, Aggregate Intrinsic Value $ 1,641