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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015 | Nov. 30, 2014
Property, Plant and Equipment [Line Items] |  |  |  |
Allowance for doubtful accounts receivable | $ 56,000 | $ 32,000 |  |
Unbilled receivables, current | 1,600,000 | 617,000 |  |
Restricted cash | 150,000 | 150,000 |  |
Depreciation and amortization | 168,000 | 156,000 |  |
Capital lease asset | 124,000 | 124,000 |  |
Capital leases, income statement, amortization expense | $ 24,045 | 24,818 |  |
Capital leases, future minimum payments, executory costs |  |  |  | $ 149,000
Capital leases monthly payments |  |  |  | $ 3,000
Capital leases of lessee, contingent rentals, basis spread on variable rate | 5.00% |  |  |
Unrecognized tax benefits | $ 121,000 | $ 165,000 | $ 100,000 |
Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Useful life | 3 years |  |  |
Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Useful life | 7 years |  |  |

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735 + Details
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- Definition Amounts to be paid by lessee to lessor for maintenance, insurance, and tax expenses related to the leased asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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