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Note 6 - Stockholders' Equity and Dilutive Equity Instruments - Dilutive Equity Instruments (Details) (Parentheticals) - $ / shares
Jun. 30, 2022
Jun. 30, 2021
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