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Note 8 - Stockholders' Equity - Restricted Stock Unit Activity (Details)
 6 Months Ended
Sep. 30, 2023
$ / shares
shares
Restricted Stock Units (RSUs) [Member]  
Outstanding as of March 31, 2023(1) (in shares) | shares 57 [1]
Outstanding as of March 31, 2023(1) (in dollars per share) | $ / shares $ 209.27 [1]
Awards granted(1) (in shares) | shares 53 [1]
Awards granted(1) (in dollars per share) | $ / shares $ 134.35 [1]
Awards forfeited (in shares) | shares (3)
Awards forfeited (in dollars per share) | $ / shares $ 179.82
Awards distributed (in shares) | shares (25)
Awards distributed, weighted average grant date fair value per share (in dollars per share) | $ / shares $ 208.33
Outstanding as of September 30, 2023(1) (in shares) | shares 82 [1],[2]
Outstanding as of September 30, 2023(1) (in dollars per share) | $ / shares $ 162.48 [1]
Performance Stock Units [Member]  
Outstanding as of March 31, 2023(1) (in shares) | shares 44 [1]
Outstanding as of March 31, 2023(1) (in dollars per share) | $ / shares $ 286.02 [1]
Awards granted(1) (in shares) | shares 32 [1]
Awards granted(1) (in dollars per share) | $ / shares $ 132.29 [1]
Awards forfeited (in shares) | shares 0
Awards forfeited (in dollars per share) | $ / shares $ 0
Awards distributed (in shares) | shares 0
Awards distributed, weighted average grant date fair value per share (in dollars per share) | $ / shares $ 0
Outstanding as of September 30, 2023(1) (in shares) | shares 76 [1],[2]
Outstanding as of September 30, 2023(1) (in dollars per share) | $ / shares $ 223.07 [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.