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Note 8 - Stockholders' Equity - Cash Dividends Declared (Details) - $ / shares					3 Months Ended		9 Months Ended
	Apr. 23, 2021	Jan. 15, 2021	Jan. 22, 2020	Oct. 22, 2019	May 31, 2021	May 31, 2020	May 31, 2021	May 31, 2020
Amount (in dollars per share)	$ 0.065	$ 0.065	$ 0.065	$ 0.065	$ 0.065	$ 0.00	$ 0.13	$ 0.13
Record date	May 05, 2021	Feb. 03, 2021	Feb. 05, 2020	Nov. 06, 2019
Payable date	May 19, 2021	Feb. 17, 2021	Feb. 19, 2020	Nov. 20, 2019

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

+ Details

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586

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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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