Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	Jan. 31, 2019	Apr. 30, 2018
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill and identifiable intangible in connection with acquisitions of the Washington mini-casinos	$ 16,322,702	$ 16,381,639

Goodwill and Intangible Assets Disclosure [Line Items]

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