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Note 18 - Subsequent Events (Details Textual) - $ / shares |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 22, 2019 | Jul. 24, 2019 | Apr. 25, 2019 | Jan. 23, 2019 | Oct. 24, 2018 | Jul. 25, 2018 | Apr. 25, 2018 | Jan. 24, 2018 | Nov. 20, 2017 | Aug. 31, 2019 | Aug. 31, 2018
Common Stock, Dividends, Per Share, Declared |  | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.24 | $ 0.20
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.065 |  |  |  |  |  |  |  |  |  |

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- 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 + Details
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |