Earnings per share (Details Textual) - shares	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Line Items]
Weighted Average Number of Shares Outstanding, Basic and Diluted	4,013,537	4,013,537	4,013,537	4,013,537