Accounting for the Costs of Computer Software Developed for Internal Use (Detail Textuals) (Computer Software Developed For Internal Use, USD $)	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Finite-Lived Intangible Assets [Line Items]
Capitalized cost of development of software for internal use	$ 2,457,000	$ 3,383,000
Development costs for the digital production software project	2,326,000	2,153,000
Development costs related to a new fulfillment system	131,000	1,230,000
Amortization expense	$ 1,295,000	$ 446,000	$ 332,000
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