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Note 7 - Stockholders' Equity - Stock Option and Restricted Stock Unit Award Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
shares
Mar. 31, 2021
USD ($)
$ / shares
shares
Options outstanding (in shares) | shares 253  
Options outstanding, weighted-average exercise price (in dollars per share) | $ / shares $ 129.55  
Outstanding, Weighted- Average Remaining Contractual Life (Year) 2 years 9 months 18 days 2 years 8 months 12 days
Outstanding, Aggregate Intrinsic Value | $ $ 37,597 $ 28,856
Options granted (in shares) | shares 37  
Options granted, weighted-average exercise price (in dollars per share) | $ / shares $ 268.85  
Options forfeited or expired (in shares) | shares (4)  
Options forfeited or expired, weighted-average exercise price (in dollars per share) | $ / shares $ 191.52  
Awards exercised (in shares) | shares (62)  
Awards exercised, weighted-average exercise price (in dollars per share) | $ / shares $ 98.99  
Options outstanding (in shares) | shares 224 253
Options outstanding, weighted-average exercise price (in dollars per share) | $ / shares $ 159.79 $ 129.55