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Note 6 - Stockholders' Equity and Dilutive Equity Instruments (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
Jun. 24, 2022
Jun. 30, 2022
Apr. 22, 2022
Jun. 30, 2021
Out-of-the-money Warrants [Member]        
Class of Warrant or Right, Outstanding (in shares)   5,923,399   5,923,399
Series A Warrants [Member]        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 57.06   $ 57.06
Series B Warrants [Member]        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   62.28   62.28
GLF Equity Warrants [Member]        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 100.00   $ 100.00
Warrans Issued to Acquire Swire Pacific Offshore Holdings Ltd. [Member]        
Fair Value Adjustment of Warrants $ 14.2      
Share Price (in dollars per share) $ 21.83   $ 20.08  
Adjustments to Additional Paid in Capital, Warrant Issued $ 176.8