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Note 8 - Stockholders' Equity - Cash Dividends Declared (Details) - $ / shares |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Feb. 28, 2025 | Feb. 28, 2025 | Feb. 29, 2024 | Feb. 28, 2025 | Feb. 29, 2024
Amount, per share (in dollars per share) |  | $ 0.07 | $ 0.07 | $ 0.14 | $ 0.14
O 2025 Q1 Dividends [Member] |  |  |  |  |
Declaration date |  |  |  | Oct. 16, 2024 |
Amount, per share (in dollars per share) |  |  |  | $ 0.07 |
Record date |  |  |  | Oct. 30, 2024 |
Payable date |  |  |  | Nov. 13, 2024 |
O 2024 Q1 Dividends [Member] |  |  |  |  |
Declaration date | Oct. 18, 2023 |  |  |  |
Amount, per share (in dollars per share) |  |  |  |  | $ 0.07
Record date |  |  |  |  | Nov. 01, 2023
Payable date |  |  |  |  | Nov. 15, 2023
O, 2024, Q2, Dividends [Member] |  |  |  |  |
Declaration date | Jan. 17, 2024 |  |  |  |
Amount, per share (in dollars per share) |  |  |  |  | $ 0.07
Record date |  |  |  |  | Jan. 31, 2024
Payable date |  |  |  |  | Feb. 14, 2024
O 2025 Q2 Dividends [Member] |  |  |  |  |
Declaration date |  |  |  | Jan. 15, 2025 |
Amount, per share (in dollars per share) |  |  |  | $ 0.07 |
Record date |  |  |  | Jan. 29, 2025 |
Payable date |  |  |  | Feb. 12, 2025 |

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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 -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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- 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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- Definition Date the dividend to be paid was declared, 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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