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Note 8 - Stockholders' Equity - Restricted Stock Unit Activity (Details)
 6 Months Ended
Sep. 30, 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 39 [1]
Awards granted(1) (in dollars per share) | $ / shares $ 187.44 [1]
Performance adjustment(2) (in shares) | shares 0 [2]
Performance adjustment(2) (in dollars per share) | $ / shares $ 0 [2]
Awards forfeited (in shares) | shares (5)
Awards forfeited (in dollars per share) | $ / shares $ 241.94
Awards distributed(2) (in shares) | shares (24)
Awards distributed, weighted average grant date fair value per share (in dollars per share) | $ / shares $ 247.29
Outstanding as of September 30, 2022(1) (in shares) | shares 61 [1],[2]
Outstanding as of September 30, 2022(1) (in dollars per share) | $ / shares $ 214.47 [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 $ 172.15 [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 September 30, 2022(1) (in shares) | shares 66 [1],[2]
Outstanding as of September 30, 2022(1) (in dollars per share) | $ / shares $ 265.39 [1]
[1] Balances for performance-based restricted stock units ("PSUs") are reflected at target.
[2] During the three months ended June 30, 2022, the fiscal year 2020 PSUs vested and were paid at 126% of target, based on actual performance results and completion of service conditions.