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Note 2 - Summary of Significant Accounting Policies - Estimated Useful Lives (Details)
12 Months Ended
Jun. 30, 2019
Equipment [Member] | Minimum [Member]  
Property, Plant and Equipment, Useful Life (Year) 3 years
Equipment [Member] | Maximum [Member]  
Property, Plant and Equipment, Useful Life (Year) 7 years
Office Equipment [Member] | Minimum [Member]  
Property, Plant and Equipment, Useful Life (Year) 2 years
Office Equipment [Member] | Maximum [Member]  
Property, Plant and Equipment, Useful Life (Year) 5 years
Furniture and Fixtures [Member] | Minimum [Member]  
Property, Plant and Equipment, Useful Life (Year) 2 years
Furniture and Fixtures [Member] | Maximum [Member]  
Property, Plant and Equipment, Useful Life (Year) 5 years