Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Apr. 30, 2012	Apr. 30, 2011
Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable, allowance	$ 345	$ 503
Property and equipment, net	4,837	3,887
Other assets, allowances	$ 0	$ 91
Preferred Stock, Par Value	$ 0.001	$ 0.001
Preferred Stock, Shares Authorized	7,931,370	7,931,370
Preferred Stock, Shares Outstanding	1,666,667	0
Common Stock, Par Value	$ 0.001	$ 0.001
Common Stock, Shares Authorized	40,000,000	40,000,000
Common Stock, Shares Outstanding	14,717,777	14,578,277