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Significant Customers - Narrative (Details) - USD ($) | 12 Months Ended
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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%

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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(9)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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