Property, plant and equipment (Narrative) (Details)	9 Months Ended
	Mar. 31, 2016 USD ($)
Property, Plant And Equipment 1	$ 500,000.0
Property, Plant And Equipment 2	1,500,000.0
Property, Plant And Equipment 3	1,600,000.0
Property, Plant And Equipment 4	400,000.0
Property, Plant And Equipment 5	1,100,000.0
Property, Plant And Equipment 6	4,300,000.0
Property, Plant And Equipment 7	$ 3,300,000.0