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Note 8 - Stockholders' Equity - Cash Dividends Declared (Details) - $ / shares						3 Months Ended		9 Months Ended
	Jan. 22, 2020	Oct. 22, 2019	Apr. 25, 2019	Jan. 23, 2019	Oct. 24, 2018	May 31, 2020	May 31, 2019	May 31, 2020	May 31, 2019
Amount (in dollars per share)	$ 0.065	$ 0.065	$ 0.06	$ 0.06	$ 0.06	$ 0	$ 0.06	$ 0.13	$ 0.18
Record date	Feb. 05, 2020	Nov. 06, 2019	May 09, 2019	Feb. 06, 2019	Nov. 07, 2018
Payable date	Feb. 19, 2020	Nov. 20, 2019	May 23, 2019	Feb. 22, 2019	Nov. 21, 2018

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

X

- Definition

Date the declared dividend will be paid, in CCYY-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=121583591&loc=d3e4304-108586

+ Details

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X

- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-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