Income taxes (Narrative) (Details)	9 Months Ended
	Mar. 31, 2016 USD ($)
Income Taxes 1	$ 900,000.0
Income Taxes 2	100.00%
Income Taxes 3	$ 100,000.0
Income Taxes 4	0
Income Taxes 5	5,700,000.0
Income Taxes 6	$ 1,000,000.0
Income Taxes 7	25.00%
Income Taxes 8	25.00%
Income Taxes 9	15.00%
Income Taxes 10	25.00%
Income Taxes 11	10.00%
Income Taxes 12	$ 2,600,000.0
Income Taxes 13	2,800,000.0
Income Taxes 14	$ 300,000.0