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Note 11 - 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, 2021
Mar. 31, 2020
Mar. 31, 2019
Options outstanding (in shares) 286    
Options outstanding, weighted average exercise price (in dollars per share) $ 107.72    
Outstanding, Weighted- Average Remaining Contractual Life (Year) 2 years 8 months 12 days 3 years 1 month 6 days  
Outstanding, Aggregate Intrinsic Value $ 28,856 $ 33,927  
Options granted (in shares) 36    
Options granted, weighted average exercise price (in dollars per share) $ 226.72 $ 206.35 $ 144.96
Options forfeited or expired (in shares) (13)    
Options forfeited or expired, weighted average exercise price (in dollars per share) $ 115.23    
Options exercised or distributed (in shares) (56)    
Options exercised or distributed, weighted average exercise price (in dollars per share) $ 84.40    
Options outstanding (in shares) 253 286  
Options outstanding, weighted average exercise price (in dollars per share) $ 129.55 $ 107.72  
Options exercisable (in shares) 121    
Exercisable, weighted average exercise price (in dollars per share) $ 102.31    
Exercisable, Weighted- Average Remaining Contractual Life (Year) 2 years    
Exercisable, Aggregate Intrinsic Value $ 17,155    
Vested and expected to vest (in shares) 246    
Vested and expected to vest, weighted average exercise price (in dollars per share) $ 132.59    
Vested and expected to vest, Weighted- Average Remaining Contractual Life (Year) 2 years 8 months 12 days    
Vested and expected to vest, Aggregate Intrinsic Value $ 28,847