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Note 13 - Stock-based Compensation and Purchase Plans - Summary of Awards Activity Under the Executive Compensation Program (Details) - USD ($)	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Annual Component [Member]
Outstanding, beginning balance (in shares)	32,387
Outstanding, weighted average grant date fair value (in dollars per share)	$ 64.33
Non-vested, aggregate intrinsic value	$ 691,647	$ (685,647)
Granted (in shares)	19,311
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 43.16
Exercised / vested (in shares)	(10,474)
Exercised / vested, weighted average exercise price (in dollars per share)	$ 64.32
Exercised / vested, aggregate intrinsic value	$ (43,978)
Forfeited, number of shares (in shares)	(105)
Canceled, weighted average grant date fair value (in dollars per share)	$ 76.65
Outstanding, ending balance (in shares)	41,119	32,387
Outstanding, weighted average grant date fair value (in dollars per share)	$ 54.36	$ 64.33
Performance Stock Units [Member]
Outstanding, beginning balance (in shares)	79,312
Outstanding, weighted average grant date fair value (in dollars per share)	$ 84.87
Granted (in shares)	69,071
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 58.81
Exercised / vested (in shares)	(12,560)
Exercised / vested, weighted average exercise price (in dollars per share)	$ 91.75
Forfeited, number of shares (in shares)	(6,396)
Canceled, weighted average grant date fair value (in dollars per share)	$ 85.51
Outstanding, ending balance (in shares)	129,427	79,312
Outstanding, weighted average grant date fair value (in dollars per share)	$ 70.27	$ 84.87

X

- Definition

The intrinsic value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units, as calculated by applying the disclosed pricing methodology.

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- Definition

The intrinsic value of equity-based payment equity instruments, excluding stock (or unit) options, that vested during the reporting period as calculated by applying the disclosed pricing methodology.

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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- Definition

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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-Topic 718
-SubTopic 10
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-Paragraph 2
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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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- 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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