Note 9 - Stock Transactions and Stock-based Compensation - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Awards granted, weighted average grant date fair value per share (in dollars per share)	$ 133.3	$ 187.21
Awards distributed, aggregate intrinsic value		$ 3,658,000	$ 5,004,000
Equity Plan 2014 [Member]
Nonvested (in shares)	76,000
Nonvested, weighted average grant date fair value per share (in dollars per share)	$ 157.83
Nonvested, weighted average remaining contractual life (Year)	1 year	1 year
Nonvested, aggregate intrinsic value	$ 17,197,000	$ 8,325,000
Awards granted (in shares)	117,000
Awards granted, weighted average grant date fair value per share (in dollars per share)	$ 94.3
Awards forfeited (in shares)	(11)
Awards forfeited or expired, weighted average grant date fair value per share (in dollars per share)	$ 120.39
Awards distributed (in shares)	(37,000)
Awards distributed, weighted average grant date fair value per share (in dollars per share)	$ 169.12
Awards distributed, aggregate intrinsic value	$ 3,928
Nonvested (in shares)	145,000	76,000
Nonvested, weighted average grant date fair value per share (in dollars per share)	$ 106.54	$ 157.83
Expected to vest (in shares)	130,000
Expected to vest, weighted average grant date fair value per share (in dollars per share)	$ 107.29
Expected to vest, weighted average remaining contractual life (Year)	1 year 1 month 6 days
Expected to vest, aggregate intrinsic value	$ 15,466,000

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

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest equity based awards other than options outstanding. Includes, but is not limited to, unvested equity based awards for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest equity instruments other than options outstanding that can be converted into shares

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Per share or unit weighted-average fair value of vested and expected to vest equity based awards under share-based payment arrangement.

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Weighted average remaining contractual term for fully vested and expected to vest equity based awards other than options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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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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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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 718
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-Name Accounting Standards Codification
-Paragraph 2
-Section 50
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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- Definition

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

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- Definition

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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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