Accounting for the Costs of Computer Software Developed for Internal Use (Detail Textuals) (Computer Software Developed For Internal Use, USD $)	9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Capitalized cost of development of software for internal use	$ 1,546,000	$ 2,992,000
Development costs for the digital production software project	1,444,000	1,876,000
Development costs related to a new fulfillment system	102,000	1,116,000
Amortization expense	$ 937,000	$ 191,000
Minimum
Finite-Lived Intangible Assets [Line Items]
Expected useful life of the asset	3 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Expected useful life of the asset	5 years