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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