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Note 8 - Stock Transaction and Stock-based Compensation - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Outstanding, shares (in shares)	8,000
Outstanding, weighted average grant date fair value per share (in dollars per share)	$ 126.03
Outstanding, weighted average remaining contractual life (Year)	2 years 36 days	4 years 182 days
Outstanding, aggregate intrinsic value	$ 7,155	$ 982
Awards granted, shares (in shares)	29,000
Awards granted, weighted average grant date fair value per share (in dollars per share)	$ 171.13	$ 136.26	$ 122.98
Awards granted, aggregate intrinsic value
Awards forfeited or expired (in shares)	(3)
Awards forfeited or expired (in dollars per share)	$ 168.24
Awards forfeited or expired, aggregate intrinsic value
Awards vested, shares (in shares)	(3,000)
Awards vested, weighted average grant date fair value per share (in dollars per share)	$ 149.44
Awards vested, aggregate intrinsic value
Outstanding, shares (in shares)	31	8,000
Outstanding, weighted average grant date fair value per share (in dollars per share)	$ 162.23	$ 126.03

X

- Definition

Intrinsic value of equity-based compensation awards forfeited. Excludes stock and unit options.

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Intrinsic value of equity-based compensation awards granted. Excludes stock and unit options.

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options.

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