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INCOME TAXES - Additional information (Details) - USD ($)
12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
INCOME TAXES    
Operating Loss Carryforwards State Subject To Expiration Current $ 107,232,000  
Unrecognized Tax Benefits, Period Increase (Decrease) 0 $ 0
Income Tax Examination, Penalties and Interest Accrued 0 $ 0
Operating Loss Carryforwards 6,589,000  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 304,000