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Accounting for the Costs of Computer Software Developed for Internal Use (Detail Textuals) (USD $)
 9 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Internal Use Software [Abstract]    
Capitalized cost of development of software for internal use $ 1,802,000us-gaap_CapitalizedComputerSoftwareAdditions $ 1,874,000us-gaap_CapitalizedComputerSoftwareAdditions
Development costs for digital production software project 1,792,000valu_CapitalizedSoftwareDevelopmentCostsForProject 1,823,000valu_CapitalizedSoftwareDevelopmentCostsForProject
Development costs related to new fulfillment system 10,000valu_CapitalizedSoftwareDevelopmentCostsForNewSystems 51,000valu_CapitalizedSoftwareDevelopmentCostsForNewSystems
Internal costs to develop software 1,195,000valu_InternalCostsToDevelopSoftware 1,255,000valu_InternalCostsToDevelopSoftware
Third party programmers' costs 607,000valu_ThirdPartyProgrammersCosts 619,000valu_ThirdPartyProgrammersCosts
Expected useful life of asset 5 years  
Amortization expense $ 1,683,000us-gaap_CapitalizedComputerSoftwareAmortization $ 1,310,000us-gaap_CapitalizedComputerSoftwareAmortization