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Note 8 - Stockholders' Equity - Stock Option and Restricted Stock Unit Award Activity (Details)
shares in Thousands
 6 Months Ended
Sep. 30, 2020
$ / shares
shares
Options outstanding (in shares) | shares 286
Options outstanding, weighted-average exercise price (in dollars per share) | $ / shares $ 107.72
Options granted (in shares) | shares 36
Options granted, weighted-average exercise price (in dollars per share) | $ / shares $ 226.72
Options forfeited or expired (in shares) | shares (10)
Options forfeited or expired, weighted-average exercise price (in dollars per share) | $ / shares $ 112.27
Options, awards exercised (in shares) | shares (36)
Awards exercised, weighted-average exercise price (in dollars per share) | $ / shares $ 83.69
Options outstanding (in shares) | shares 276
Options outstanding, weighted-average exercise price (in dollars per share) | $ / shares $ 126.30