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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, 2020
Mar. 31, 2019
Mar. 31, 2018
Options outstanding (in shares) 354    
Options outstanding, weighted average exercise price (in dollars per share) $ 94.04    
Outstanding, Weighted- Average Remaining Contractual Life (Year) 3 years 36 days 3 years 292 days  
Outstanding, Aggregate Intrinsic Value $ 33,927 $ 48,301  
Options granted (in shares) 29    
Options granted, weighted average exercise price (in dollars per share) $ 206.35 $ 144.96 $ 123.13
Options forfeited or expired (in shares) (36)    
Options forfeited or expired, weighted average exercise price (in dollars per share) $ 100.18    
Options exercised or distributed (in shares) (61)    
Options exercised or distributed, weighted average exercise price (in dollars per share) $ 79.81    
Options outstanding (in shares) 286 354  
Options outstanding, weighted average exercise price (in dollars per share) $ 107.72 $ 94.04  
Options exercisable (in shares) 121    
Exercisable, weighted average exercise price (in dollars per share) $ 88.77    
Exercisable, Weighted- Average Remaining Contractual Life (Year) 2 years 255 days    
Exercisable, Aggregate Intrinsic Value $ 16,583    
Vested and expected to vest (in shares) 278    
Vested and expected to vest, weighted average exercise price (in dollars per share) $ 107.32    
Vested and expected to vest, Weighted- Average Remaining Contractual Life (Year) 3 years 36 days    
Vested and expected to vest, Aggregate Intrinsic Value $ 33,031