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Note 8 - Stockholders' Equity - Dividends Declared (Details) - $ / shares							3 Months Ended		9 Months Ended
	Apr. 17, 2024	Jan. 17, 2024	Oct. 18, 2023	Apr. 21, 2023	Jan. 20, 2023	Oct. 20, 2022	May 31, 2024	May 31, 2023	May 31, 2024	May 31, 2023
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.21	$ 0.21
Record Date	May 01, 2024	Jan. 31, 2024	Nov. 01, 2023	May 03, 2023	Feb. 01, 2023	Nov. 03, 2022
Payable Date	May 15, 2024	Feb. 14, 2024	Nov. 15, 2023	May 17, 2023	Feb. 15, 2023	Nov. 16, 2022

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Date the declared dividend will be paid, in YYYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-3

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

Date the holder must own the stock to be entitled to the dividend, in YYYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration