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Note 8 - Stockholders' Equity - Restricted Stock Unit Activity (Details) shares in Thousands	6 Months Ended
	Sep. 30, 2020 $ / shares shares
Awards exercised, weighted-average exercise price (in dollars per share)	$ 83.69
Restricted Stock Units (RSUs) [Member]
Nonvested, number of shares (in shares) | shares	28
Nonvested, weighted average grant date fair value per share (in dollars per share)	$ 180.15
Awards granted, number of shares (in shares) | shares	19
Awards granted, weighted average grant date fair value per share (in dollars per share)	$ 225.32
Awards forfeited or expired, number of shares (in shares) | shares	(3)
Awards forfeited or expired, weighted average grant date fair value per share (in dollars per share)	$ 205.10
Awards distributed, number of shares (in shares) | shares	(5)
Awards exercised, weighted-average exercise price (in dollars per share)	$ 177.17
Nonvested , number of shares (in shares) | shares	39
Nonvested, weighted average grant date fair value per share (in dollars per share)	$ 201.49
Performance Stock Units [Member]
Nonvested, number of shares (in shares) | shares	22
Nonvested, weighted average grant date fair value per share (in dollars per share)	$ 204.68
Awards granted, number of shares (in shares) | shares	0
Awards granted, weighted average grant date fair value per share (in dollars per share)	$ 0
Awards forfeited or expired, number of shares (in shares) | shares	(1)
Awards forfeited or expired, weighted average grant date fair value per share (in dollars per share)	$ 199.50
Awards distributed, number of shares (in shares) | shares	0
Awards exercised, weighted-average exercise price (in dollars per share)	$ 0
Nonvested , number of shares (in shares) | shares	21
Nonvested, weighted average grant date fair value per share (in dollars per share)	$ 204.80

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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