Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
Oct. 31, 2021
Apr. 30, 2021
Statement of Financial Position [Abstract]    
Accounts receivable, allowance $ 3,345,182 $ 3,289,816
Accounts receivable, secured, allowance $ 0 $ 625,963
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 issued (in shares) 0 0
Preferred stock outstanding (in shares) 0 0
Common stock par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 40,000,000 40,000,000
Common stock issued (in shares) 25,148,194 25,066,297
Common stock outstanding (in shares) 24,992,708 24,910,811
Treasury stock (in shares) 155,486 155,486