Annual report pursuant to Section 13 and 15(d)

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details)

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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]    
Deferred tax assets, beginning balance $ 14,187,771 $ 13,235,601
Additions charged to costs and expenses 0 0
Charged to other accounts 1,341,187 952,170
Deductions 0 0
Deferred tax assets, ending balance $ 15,528,958 $ 14,187,771