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Note 8 - Stockholders' Equity - Restricted Stock Unit Activity (Details)
 9 Months Ended
Dec. 31, 2022
$ / shares
shares
Restricted Stock Units (RSUs) [Member]  
Outstanding as of March 31, 2022(1) (in shares) | shares 51 [1]
Outstanding as of March 31, 2022(1) (in dollars per share) | $ / shares $ 252.86 [1]
Awards granted(1) (in shares) | shares 42 [1]
Awards granted(1) (in dollars per share) | $ / shares $ 187.45 [1]
Performance adjustment(2) (in shares) | shares 0 [2]
Performance adjustment(2) (in dollars per share) | $ / shares $ 0 [2]
Awards forfeited (in shares) | shares (8)
Awards forfeited (in dollars per share) | $ / shares $ 232.20
Awards distributed(2) (in shares) | shares (26)
Awards distributed, weighted average grant date fair value per share (in dollars per share) | $ / shares $ 250.81
Outstanding as of December 31, 2022(1) (in shares) | shares 59 [1],[2]
Outstanding as of December 31, 2022(1) (in dollars per share) | $ / shares $ 210.44 [1]
Performance Stock Units [Member]  
Outstanding as of March 31, 2022(1) (in shares) | shares 55 [1]
Outstanding as of March 31, 2022(1) (in dollars per share) | $ / shares $ 288.45 [1]
Awards granted(1) (in shares) | shares 19 [1]
Awards granted(1) (in dollars per share) | $ / shares $ 179.63 [1]
Performance adjustment(2) (in shares) | shares 2 [2]
Performance adjustment(2) (in dollars per share) | $ / shares $ 202.00 [2]
Awards forfeited (in shares) | shares 0
Awards forfeited (in dollars per share) | $ / shares $ 0
Awards distributed(2) (in shares) | shares (10)
Awards distributed, weighted average grant date fair value per share (in dollars per share) | $ / shares $ 202.00
Outstanding as of December 31, 2022(1) (in shares) | shares 66 [1],[2]
Outstanding as of December 31, 2022(1) (in dollars per share) | $ / shares $ 267.97 [1]
[1] Balances for PSUs are reflected at target.
[2] During the nine months ended December 31, 2022, the fiscal year 2020 PSUs vested and were distributed at 126% of target, based on actual performance results and completion of service conditions.