Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
Oct. 31, 2017
Apr. 30, 2017
Assets    
Allowance for doubtful accounts, current accounts receivables $ 414,364 $ 328,864
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 13,613,996 13,504,012
Common stock, shares outstanding 13,597,329 13,487,345
Treasury stock, shares 16,667 16,667