Note 7 - Land Use Rights (Details) - USD ($)	3 Months Ended	6 Months Ended
Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Details
Amortization expense - Land use rights	$ 13,204	$ 13,916	$ 26,586	$ 28,408

Represents the monetary amount of Amortization expense - Land use rights, during the indicated time period.

No definition available.

Name:	fil_AmortizationExpenseLandUseRights
Namespace Prefix:	fil_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration