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Notes payable (Details) (Parentheticals) - USD ($)
1 Months Ended 12 Months Ended
Feb. 25, 2014
Jun. 30, 2019
Feb. 13, 2019
Jun. 30, 2018
Jan. 20, 2017
Senior Secured Promissory Notes          
Debt Instrument [Line Items]          
Interest rate on notes payable 12.00%        
Period of debt repayment   monthly      
Maturity date of notes payable Feb. 25, 2014 Dec. 31, 2018      
Debt conversion per share         $ 0.16
Robofusion note payable          
Debt Instrument [Line Items]          
Interest rate on notes payable   3.25%      
Period of debt repayment   due quarterly, over a 3 year period      
Recognized original issue discount on Note payable   $ 49,710   $ 99,426  
Promissory Note          
Debt Instrument [Line Items]          
Period of debt repayment   due monthly, over an 18 month period      
Recognized original issue discount on Note payable   $ 21,000 $ 27,000 $ 0