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Note 8 - Stockholders' Equity - Cash Dividends Declared (Details) - $ / shares					3 Months Ended		6 Months Ended
	Jan. 22, 2020	Oct. 22, 2019	Jan. 23, 2019	Oct. 24, 2018	Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Declaration date	Jan. 22, 2020	Oct. 22, 2019	Jan. 23, 2019	Oct. 24, 2018
Amount (in dollars per share)	$ 0.065	$ 0.065	$ 0.06	$ 0.06	$ 0.065	$ 0.06	$ 0.13	$ 0.12
Record date	Feb. 05, 2020	Nov. 06, 2019	Feb. 06, 2019	Nov. 07, 2018
Payable date	Feb. 19, 2020	Nov. 20, 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=27012166&loc=d3e187085-122770

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- 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=98513485&loc=d3e4304-108586

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- Definition

Date the dividend to be paid was declared, 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
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- Definition

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

+ References

No definition available.

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