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2. LIQUIDITY AND MANAGEMENT PLANS (Details Narrative) - USD ($)
3 Months Ended 9 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2017
Jan. 31, 2016
Apr. 30, 2016
Liquidity And Management Plans          
Accumulated deficit $ (87,980,280)   $ (87,980,280)   $ (84,691,617)
Net loss $ (1,282,146) $ (1,791,097) $ (3,288,663) $ (4,941,720)