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Note 5 - Subsequent Events (Details Textual) - shares
1 Months Ended 6 Months Ended
Aug. 31, 2021
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exchanged (in shares)   3,500,000
Stock Issued During Period, Shares, Stock Options Exchanged for Common Shares (in shares)   2,100,000
Subsequent Event [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exchanged (in shares) 1,500,000  
Stock Issued During Period, Shares, Stock Options Exchanged for Common Shares (in shares) 900,000