Note 5 - Land Use Rights (Details) - USD ($)	3 Months Ended	9 Months Ended
Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
Details
Amortization expense - Land use rights	$ 13,471	$ 12,812	$ 39,736	$ 39,398

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