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Note 5 - Stockholders' Equity and Dilutive Equity Instruments - Dilutive Equity Instruments (Details) (Parentheticals) - $ / shares | Jun. 30, 2021 | Jun. 30, 2020
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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

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
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