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Note 8 - 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, 2019
Mar. 31, 2018
Options outstanding (in shares) 458  
Options outstanding, weighted average exercise price (in dollars per share) $ 86.38  
Outstanding, Weighted- Average Remaining Contractual Life (Year) 3 years 292 days 4 years 182 days
Outstanding, Aggregate Intrinsic Value $ 48,301 $ 28,445
Options granted (in shares) 26  
Options granted, weighted average exercise price (in dollars per share) $ 144.96  
Options forfeited or expired (in shares) (38)  
Options forfeited or expired, weighted average exercise price (in dollars per share) $ 99  
Options exercised (in shares) (92)  
Awards exercised (in dollars per share) $ 67.84  
Options outstanding (in shares) 354 458
Options outstanding, weighted average exercise price (in dollars per share) $ 94.04 $ 86.38
Options exercisable (in shares) 121  
Exercisable, weighted average exercise price (in dollars per share) $ 78.30  
Exercisable, Weighted- Average Remaining Contractual Life (Year) 3 years 182 days  
Exercisable, Aggregate Intrinsic Value $ 18,374  
Vested and expected to vest (in shares) 331  
Vested and expected to vest, weighted average exercise price (in dollars per share) $ 93.29  
Vested and expected to vest, Weighted- Average Remaining Contractual Life (Year) 3 years 292 days  
Vested and expected to vest, Aggregate Intrinsic Value $ 45,463