Note 9 - Prepaid Expenses and Other Current Assets (Details) - USD ($)	Oct. 31, 2016	Apr. 30, 2016
Details
Prepaid expenses and other current assets	$ 3,022,382	$ 2,787,371
Prepayments to suppliers	1,452,755	1,220,523
Prepayment for employees' stock-based compensation	1,226,668	1,371,667
Prepayment for consultants' stock-based compensation	72,500
Business related employees' advances	$ 270,459	$ 195,181

Represents the monetary amount of Business related employees' advances, as of the indicated date.

No definition available.

Name:	fil_BusinessRelatedEmployeesAdvances
Namespace Prefix:	fil_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the monetary amount of Prepaid expenses and other current assets, as of the indicated date.

No definition available.

Name:	fil_PrepaidExpensesAndOtherCurrentAssets
Namespace Prefix:	fil_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the monetary amount of Prepayment for consultants' stock-based compensation, as of the indicated date.

No definition available.

Name:	fil_PrepaymentForConsultantsStockBasedCompensation
Namespace Prefix:	fil_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the monetary amount of Prepayment for employees' stock-based compensation, as of the indicated date.

No definition available.

Name:	fil_PrepaymentForEmployeesStockBasedCompensation
Namespace Prefix:	fil_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the monetary amount of Prepayments to suppliers, as of the indicated date.

No definition available.

Name:	fil_PrepaymentsToSuppliers
Namespace Prefix:	fil_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

No definition available.