Summary of significant accounting policies (Tables)

9 Months Ended

Mar. 31, 2016

Schedule of Ownership of Subsidiaries and VIE's [Table Text Block]

		Ownership
Subsidiaries and VIEs	Place incorporated	percentage
BVI-ACM	British Virgin Island	100%
China-ACMH	Beijing, China	100%
Xin Ao	Beijing, China	VIE
Heng Yuan Zheng Ke	Beijing, China	VIE
Hong Sheng An	Beijing, China	VIE
Heng Tai	Beijing, China	VIE
Da Tong	Datong, China	VIE
Heng Xin	Luanxian, China	VIE

Schedule of carrying amount of the VIE's assets and liabilities [Table Text Block]

		March 31,			June 30,
		2016			2015
Current assets	$	98,409,663		$	115,628,360
Property, plant and equipment		7,916,070			10,154,170
Other noncurrent assets		-			491,100
Total assets		106,325,733			126,273,630
Liabilities		(73,676,893	)		(87,520,412	)
Intercompany payables*		(8,189,048	)		(8,650,651	)
Total liabilities		(81,865,941	)		(96,171,063	)
Net assets	$	24,459,792		$	30,102,567

Schedule of Estimated Useful Lives of Assets [Table Text Block]

	Useful life
Transportation equipment	7 - 10 years
Plant and machinery	10 years
Office equipment	5 years
Buildings and improvements	3 - 20 years