Note 10 - Accounts Payable and Accrued Expenses (Details) - USD ($)	Oct. 31, 2016	Apr. 30, 2016
Details
Commission payable	$ 113,068	$ 67,683
General liability, worker's compensation, and medical insurance payable	559,407	439,706
Union and education fees payable	285,400	297,728
Consulting fee payable	350,939	248,748
Interest payables for short-term loans	181,576	72,731
Advanced from the employees	195,303	131,282
Other miscellaneous payables	$ 82,466	213,736
Accrued R&D payable		$ 78,794