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Significant Customers - Narrative (Details) - USD ($)	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Revenue, Major Customer [Line Items]
Accounts receivable, gross	$ 4,399,000	$ 3,930,000
Customer One
Revenue, Major Customer [Line Items]
Revenues	$ 2,900,000	4,200,000
Accounts receivable, gross		$ 878,530
Customer One | Revenue
Revenue, Major Customer [Line Items]
Concentration risk percentage	10.70%	20.60%
Customer One | Accounts Receivable
Revenue, Major Customer [Line Items]
Concentration risk percentage		22.60%
Customer Two
Revenue, Major Customer [Line Items]
Revenues		$ 2,600,000
Accounts receivable, gross		$ 736,071
Customer Two | Revenue
Revenue, Major Customer [Line Items]
Concentration risk percentage		12.80%
Customer Two | Accounts Receivable
Revenue, Major Customer [Line Items]
Concentration risk percentage		19.00%

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- Definition

For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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