Significant Customers - Narrative (Details) - USD ($)	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Customer One
Revenue, Major Customer [Line Items]
Revenues	$ 3,300,000	$ 2,000,000
Accounts receivable, gross	$ 994,095	$ 401,654
Customer One | Revenue
Revenue, Major Customer [Line Items]
Concentration risk percentage	21.30%	17.60%
Customer One | Accounts Receivable
Revenue, Major Customer [Line Items]
Concentration risk percentage	43.70%	30.70%
Customer Two
Revenue, Major Customer [Line Items]
Accounts receivable, gross	$ 256,022	$ 161,150
Customer Two | Accounts Receivable
Revenue, Major Customer [Line Items]
Concentration risk percentage	11.30%	12.30%