Quarterly report pursuant to Section 13 or 15(d)

Summary of significant accounting policies (Details 2)

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Summary of significant accounting policies (Details 2) - shares
3 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Common stock equivalents 1,277,632 631,697
Options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Common stock equivalents 675,000 160,000
Warrants [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Common stock equivalents 602,632 471,697