Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED BALANCE SHEETS (Parenthetical)

v3.19.1
CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
Jan. 31, 2019
Apr. 30, 2018
Assets    
Allowance for doubtful accounts, current accounts receivables $ 903,450 $ 468,174
Allowance for doubtful accounts, noncurrent accounts receivables $ 625,963 $ 625,963
Stockholders' Equity:    
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 250,000,000 250,000,000
Common stock, shares issued 18,505,869 18,333,521
Common stock, shares outstanding 18,489,202 18,316,854
Treasury stock, shares 16,667 16,667