LIQUIDITY AND CAPITAL RESOURCES (Details Textual) - USD ($)		3 Months Ended	6 Months Ended
	Dec. 12, 2017	Oct. 31, 2017	Oct. 31, 2017	Oct. 31, 2016	Apr. 30, 2017	Apr. 30, 2016
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Working Capital Surplus		$ 2,943,000	$ 2,943,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		3,695,262	3,695,262	$ 2,070,388	$ 2,159,344	$ 2,235,597
Proceeds from Warrant Exercises		$ 1,070,000	$ 1,070,216	$ 0
Subsequent Event [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Proceeds from Warrant Exercises	$ 2,546,000