CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Jan. 31, 2013	Apr. 30, 2012
Allowance for accounts receivable	$ 1,635,761	$ 1,794,729
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	25,000,000	25,000,000
Common stock, shares issued	6,954,766	6,954,766
Common stock, shares outstanding	6,954,766	6,954,766