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OTHER INCOME - Additional information (Details) - USD ($)
3 Months Ended 9 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2021
Other Nonoperating Income $ 300,000 $ 0 $ 950,000
Settlement Agreement [Member]      
Other Nonoperating Income     650,000
Amount of settlement received     650,000
Palm Coast, Florida      
Rental income     $ 350,000