CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Oct. 31, 2015	Apr. 30, 2015
Assets
Allowance for doubtful accounts, current accounts receivables	$ 332,558	$ 279,453
Allowance for doubtful accounts, noncurrent accounts receivables	$ 625,963	$ 625,963
Stockholders' Equity:
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	128,536,938	128,253,605
Common stock, shares outstanding	128,336,938	128,053,605
Treasury stock, shares	200,000	200,000