Annual report pursuant to Section 13 and 15(d)

Summary of significant accounting policies (Details 3)

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Summary of significant accounting policies (Details 3) - shares
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Common stock equivalents 2,087,431 772,165
Option [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Common stock equivalents 1,338,859 160,000
Warrants [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Common stock equivalents 748,572 612,165