XML 60 R49.htm IDEA: XBRL DOCUMENT v3.21.2
Note 7 - Stockholders' Equity - Stock Option and Restricted Stock Unit Award Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended 12 Months Ended
Sep. 30, 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 10 months 24 days 2 years 8 months 12 days
Outstanding, Aggregate Intrinsic Value | $ $ 37,092 $ 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 (3)  
Options forfeited or expired, weighted-average exercise price (in dollars per share) | $ / shares $ 173.29  
Awards exercised (in shares) | shares (37)  
Awards exercised, weighted-average exercise price (in dollars per share) | $ / shares $ 94.49  
Options outstanding (in shares) | shares 250 253
Options outstanding, weighted-average exercise price (in dollars per share) | $ / shares $ 154.16 $ 129.55