Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
Apr. 30, 2020
Apr. 30, 2019
Assets    
Allowance for doubtful accounts $ 1,758,920 $ 1,247,031
Accounts receivable, allowance for credit loss, noncurrent 625,963 625,963
Debt instrument, unamortized discount $ 1,550,854 $ 353,328
Stockholders' Equity:    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 1,000,000 1,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.001  
Common stock, shares authorized (in shares) 40,000,000  
Common stock, shares issued (in shares) 21,770,520 18,665,551
Common stock, shares outstanding (in shares) 21,753,853 18,648,884
Treasury stock, shares 16,667 16,667