Revenue from contracts with customers (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Movement in Deferred Revenue [Roll Forward]
Deferred Revenue	$ 438,568	$ 462,631	$ 438,568	$ 462,631	$ 465,468	$ 481,180	$ 481,868	$ 388,434
Deferred Revenue, Additions	208,362	200,618	667,018	707,755
Deferred Revenue, Revenue Recognized	$ 235,262	$ 219,855	$ 709,630	$ 633,558