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Note 6 - Stockholders' Equity and Dilutive Equity Instruments - Dilutive Equity Instruments (Details) (Parentheticals) - $ / shares | Sep. 30, 2023 | Sep. 30, 2022
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New Creditor Warrants [Member] |  |
Strike price per common share (in dollars per share) | $ 0.001 | $ 0.001
GulfMark Creditor Warrants [Member] |  |
Strike price per common share (in dollars per share) | 0.01 | 0.01
SPO Acquisition Warrants [Member] |  |
Strike price per common share (in dollars per share) | $ 0.001 | $ 0.001

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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 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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