Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Apr. 30, 2013	Apr. 30, 2012
Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable, allowance	$ 278	$ 345
Property and equipment, accumulated depreciation	$ 5,526	$ 4,837
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	1,666,667
Common stock, par or value	$ 0.001	$ 0.001
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares outstanding	14,717,777	14,717,777