| Property and Equipment (Schedule Of Depreciation And Amortization Expense) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
| Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2018 | Jan. 31, 2017 | |
| Property and equipment: | ||||
| Depreciation and amortization Expense | $ 150,596 | $ 119,064 | $ 407,346 | $ 378,118 | 
| Software amortization Expense | $ 121,695 | $ 105,914 | $ 341,825 | $ 342,938 | 
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- Definition Amount of expense for amortization of capitalized computer software costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- References No definition available. 
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