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Related party transactions (Details) - USD ($)
Jun. 30, 2019
Jun. 30, 2018
Related Party Transaction [Line Items]    
Notes payable $ 1,351,021 $ 1,365,132
Less current maturities (1,314,021) (629,017)
Notes payable, excluding current maturities 37,000 736,115
Related Party    
Related Party Transaction [Line Items]    
Notes payable 296,779 536,786
Less current maturities (296,779) (536,786)
Notes payable, excluding current maturities 0 0
Related Party | Secured Promissory Notes    
Related Party Transaction [Line Items]    
Notes payable 296,779 296,779
Related Party | Convertible Promissory Note    
Related Party Transaction [Line Items]    
Notes payable $ 0 $ 240,007