Leases (Narrative) (Details) - USD ($)	3 Months Ended
	Jul. 31, 2019	Apr. 30, 2019	Jul. 31, 2018
Lessee Disclosure [Abstract]
Lease expense	$ 612,597
Right of use lease asset	7,996,585
Operating lease liabilities	$ 1,100,411		$ 500,000