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Note 7 - Stockholders' Equity - Stock Option and Restricted Stock Unit Award Activity (Details)
shares in Thousands
 6 Months Ended
Sep. 30, 2019
$ / shares
shares
Options outstanding (in shares) | shares 354
Options outstanding, weighted-average exercise price (in dollars per share) | $ / shares $ 94.04
Options granted (in shares) | shares 29
Options granted, weighted-average exercise price (in dollars per share) | $ / shares $ 205.46
Options forfeited or expired (in shares) | shares (27)
Options forfeited or expired, weighted-average exercise price (in dollars per share) | $ / shares $ 99.36
Options exercised or distributed (in shares) | shares (40)
Options exercised or distributed, weighted-average exercise price (in dollars per share) | $ / shares $ 84.54
Options outstanding (in shares) | shares 316
Options outstanding, weighted-average exercise price (in dollars per share) | $ / shares $ 104.89
Restricted Stock Units (RSUs) [Member]  
Outstanding, shares (in shares) | shares 31
Outstanding, weighted-average grant date fair value (in dollars per share) | $ / shares $ 162.23
Awards granted, shares (in shares) | shares 19
Awards granted, weighted-average grant date fair value (in dollars per share) | $ / shares $ 202.09
Awards forfeited or expired, shares (in shares) | shares (2)
Awards forfeited or expired, weighted-average grant date fair value (in dollars per share) | $ / shares $ 156.14
Awards exercised or distributed, shares (in shares) | shares (3)
Awards exercised or distributed, weighted-average grant date fair value (in dollars per share) | $ / shares $ 155.62
Outstanding, shares (in shares) | shares 45
Outstanding, weighted-average grant date fair value (in dollars per share) | $ / shares $ 180.13