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Note 8 - Stockholders' Equity - Restricted Stock Unit Activity (Details)
 3 Months Ended
Jun. 30, 2024
$ / shares
shares
Restricted Stock Units (RSUs) [Member]  
Outstanding as of March 31, 2024 (in shares) | shares 76
Outstanding as of March 31, 2024 (in dollars per share) | $ / shares $ 157.83
Awards granted(1) (in shares) | shares 101 [1]
Awards granted(1) (in dollars per share) | $ / shares $ 89.82 [1]
Awards forfeited (in shares) | shares (2)
Awards forfeited (in dollars per share) | $ / shares $ 154.69
Awards distributed (in shares) | shares (21)
Awards distributed, weighted average grant date fair value per share (in dollars per share) | $ / shares $ 182.89
Outstanding as of June 30, 2024 (in shares) | shares 154
Outstanding as of June 30, 2024 (in dollars per share) | $ / shares $ 109.69
Performance Stock Units [Member]  
Outstanding as of March 31, 2024 (in shares) | shares 56
Outstanding as of March 31, 2024 (in dollars per share) | $ / shares $ 240.96
Awards granted(1) (in shares) | shares 41 [1]
Awards granted(1) (in dollars per share) | $ / shares $ 102.57 [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 June 30, 2024 (in shares) | shares 97
Outstanding as of June 30, 2024 (in dollars per share) | $ / shares $ 181.85
[1] Balances for PSUs granted are reflected at target.