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Note 8 - Earnings Per Share (Details Textual) - Pre-Funded Warrants [Member] - $ / shares |  | 3 Months Ended
--- | --- | ---
Jun. 30, 2025 | Sep. 30, 2024
Stock Issued During Period, Shares, Exercise of Warrants (in shares) | 845,000 | 844,061
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 0.001 |

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- Definition The number of shares issued from the exercise of warrants. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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