Note 8 - Prepaid Expenses and Other Current Assets (Details) - USD ($)	Apr. 30, 2017	Apr. 30, 2016
Details
Prepaid expenses and other current assets	$ 4,729,865	$ 2,787,371
Prepayments to suppliers	3,286,808	1,220,523
Prepayment for employees' stock-based compensation	1,226,668	1,371,667
Business related employees' advances	$ 216,389	$ 195,181