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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, 2020	Jun. 30, 2019
Annual Component [Member]
Outstanding, beginning balance (in shares)	34,950
Non-vested, weighted average exercise price (in dollars per share)	$ 69.07
Non-vested, aggregate intrinsic value	$ (685,647)	$ (496,674)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	14,883
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)	$ 51.56
Vested, number of shares (in shares)	(17,108)
Vested, weighted average exercise price (in dollars per share)	$ 62.86
Vested, aggregate intrinsic value	$ 7,471
Forfeited, number of shares (in shares)	(338)
Forfeited, weighted average exercise price (in dollars per share)	$ 66.10
Outstanding, ending balance (in shares)	32,387	34,950
Non-vested, weighted average exercise price (in dollars per share)	$ 64.33	$ 69.07
Performance Stock Units [Member]
Outstanding, beginning balance (in shares)	69,052
Non-vested, aggregate intrinsic value	$ 6,731,430	$ 6,529,012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	42,976
Vested, number of shares (in shares)	(12,225)
Vested, aggregate intrinsic value	$ 1,025,922
Forfeited, number of shares (in shares)	(20,491)
Outstanding, ending balance (in shares)	79,312	69,052

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.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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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- Definition

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).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

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

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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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-Publisher FASB
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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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- 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 vested award under share-based payment arrangement. Excludes share and unit options.

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