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Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Apr. 30, 2015 | Apr. 30, 2014 | Mar. 11, 2015 | Nov. 30, 2014 | Apr. 30, 2013
Estimated Fair Value Of Warrants |  | $ 2,000,000 | $ 1,600,000 |  |
Allowance for Doubtful Accounts Receivable | $ 2,000 | 2,000 |  |  |
Unbilled Receivables, Current | 636,000 | 884,000 |  |  |
Restricted Cash and Cash Equivalents, Noncurrent | 163,000 | 165,000 |  |  |
Depreciation, Depletion and Amortization | 214,000 | 213,000 |  |  |
Deferred Revenue | $ 258,000 |  |  |  |
Capital Leases, Future Minimum Payments, Executory Costs |  |  |  | $ 149,000 |
Capital Leases of Lessee, Contingent Rentals, Basis Spread on Variable Rate | 5.00% |  |  |  |
Capital Leases, Income Statement, Amortization Expense | $ 12,405 |  |  |  |
Unrecognized Tax Benefits | 100,000 | 0 |  |  | $ 0
Capital Leases Monthly Payments |  |  |  | $ 3,000 |
Capital Lease Obligations Incurred | $ 124,000 | $ 0 |  |  |

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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=35738203&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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 + Details
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