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Note 8 - Stockholders' Equity - Stock Option and Restricted Stock Unit Award Activity (Details)
shares in Thousands
 9 Months Ended
Dec. 31, 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 (12)
Options forfeited or expired, weighted-average exercise price (in dollars per share) | $ / shares $ 116.24
Options, awards exercised (in shares) | shares (47)
Awards exercised, weighted-average exercise price (in dollars per share) | $ / shares $ 85.64
Options outstanding (in shares) | shares 263
Options outstanding, weighted-average exercise price (in dollars per share) | $ / shares $ 127.63