Accounting for the Costs of Computer Software Developed for Internal Use (Detail Textuals) (USD $)	6 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Capitalized cost of development of software for internal use	$ 1,230,000	$ 839,000
Development costs for digital production software project	1,191,000	758,000
Development costs related to new fulfillment system	39,000	81,000
Amortization expense	$ 839,000	$ 617,000
Computer Software Developed For Internal Use | Minimum
Finite-Lived Intangible Assets [Line Items]
Expected useful life of asset	3 years
Computer Software Developed For Internal Use | Maximum
Finite-Lived Intangible Assets [Line Items]
Expected useful life of asset	5 years