Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Jul. 31, 2011	Apr. 30, 2011
Statement of Financial Position [Abstract]
Allowance of accounts receivable	$ 1,631,985	$ 1,662,168
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
Tax effects on accumulated other comprehensive income - foreign currency translation	$ 191,979	$ 185,060