Schedule of New Accounting Pronouncements and Changes in Accounting Principles (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Revenues:
Revenue from Contract with Customer, Including Assessed Tax	$ 14,564,377	$ 15,535,550	$ 43,798,999	$ 48,622,345
Expenses:
Marketing and administrative	4,396,277	4,234,480	13,265,222	12,951,058
Corporate	1,630,561	578,370	4,261,090	1,909,731
Depreciation and amortization	112,537	198,522	357,193	761,111
Gain on sale of assets	0	(308)	34,356	(5,773)
Operating income	249,089	618,339	984,269	1,866,980
Net revenues	(120,713)	193,327	366,532	956,305
As Reported - With Adoption of ASC 606 [Member]
Revenues:
Revenue from Contract with Customer, Including Assessed Tax	14,564,377		43,798,999
Gross revenues	14,564,377		43,798,999
Less promotional allowances	0		0
Expenses:
Marketing and administrative	4,396,277		13,265,222
Corporate	1,630,561		4,261,090
Depreciation and amortization	112,537		357,193
Gain on sale of assets			(34,356)
Total operating expenses	14,315,288		42,814,730
Operating income	249,089		984,269
Net revenues	42,881		473,394
As Adjusted - Without Adoption of ASC 606 [Member]
Revenues:
Revenue from Contract with Customer, Including Assessed Tax	14,564,377		43,795,321
Gross revenues	15,597,967		46,780,960
Less promotional allowances	(1,033,590)		(2,985,639)
Expenses:
Marketing and administrative	4,396,277		13,265,222
Corporate	1,630,561		4,261,090
Depreciation and amortization	112,537		357,193
Gain on sale of assets			(34,356)
Total operating expenses	14,315,288		42,811,052
Operating income	249,089		984,269
Net revenues	42,881		473,394
Effect of Accounting Change Increase/(Decrease) [Member]
Revenues:
Revenue from Contract with Customer, Including Assessed Tax	0		3,678
Gross revenues	(1,033,590)		(2,981,961)
Less promotional allowances	1,033,590		2,985,639
Expenses:
Marketing and administrative	0		0
Corporate	0		0
Depreciation and amortization	0		0
Gain on sale of assets			0
Total operating expenses	0		3,678
Operating income	0		0
Net revenues	0		0
Casino [Member]
Revenues:
Revenue from Contract with Customer, Including Assessed Tax	11,547,379	12,551,816	35,051,766	40,009,065
Expenses:
Cost of Goods and Services Sold	5,342,905	7,012,292	16,684,984	22,704,066
Casino [Member] | As Reported - With Adoption of ASC 606 [Member]
Revenues:
Revenue from Contract with Customer, Including Assessed Tax	11,547,379		35,051,766
Expenses:
Cost of Goods and Services Sold	5,342,905		16,684,984
Casino [Member] | As Adjusted - Without Adoption of ASC 606 [Member]
Revenues:
Revenue from Contract with Customer, Including Assessed Tax	12,580,969		38,033,727
Expenses:
Cost of Goods and Services Sold	6,215,934		19,193,189
Casino [Member] | Effect of Accounting Change Increase/(Decrease) [Member]
Revenues:
Revenue from Contract with Customer, Including Assessed Tax	(1,033,590)		(2,981,961)
Expenses:
Cost of Goods and Services Sold	(873,029)		(2,508,205)
Food and beverage [Member]
Revenues:
Revenue from Contract with Customer, Including Assessed Tax	2,665,342	2,606,619	7,675,267	7,437,154
Expenses:
Cost of Goods and Services Sold	2,345,769	1,358,684	6,793,978	3,892,854
Food and beverage [Member] | As Reported - With Adoption of ASC 606 [Member]
Revenues:
Revenue from Contract with Customer, Including Assessed Tax	2,665,342		7,675,267
Expenses:
Cost of Goods and Services Sold	2,345,769		6,793,978
Food and beverage [Member] | As Adjusted - Without Adoption of ASC 606 [Member]
Revenues:
Revenue from Contract with Customer, Including Assessed Tax	2,665,342		7,675,267
Expenses:
Cost of Goods and Services Sold	1,503,539		4,375,020
Food and beverage [Member] | Effect of Accounting Change Increase/(Decrease) [Member]
Revenues:
Revenue from Contract with Customer, Including Assessed Tax	0		0
Expenses:
Cost of Goods and Services Sold	842,230		2,418,958
Other [Member] | As Reported - With Adoption of ASC 606 [Member]
Revenues:
Revenue from Contract with Customer, Including Assessed Tax	351,656		1,071,966
Expenses:
Cost of Goods and Services Sold	57,038		170,858
Other [Member] | As Adjusted - Without Adoption of ASC 606 [Member]
Revenues:
Revenue from Contract with Customer, Including Assessed Tax	351,656		1,071,966
Expenses:
Cost of Goods and Services Sold	26,239		77,933
Other [Member] | Effect of Accounting Change Increase/(Decrease) [Member]
Revenues:
Revenue from Contract with Customer, Including Assessed Tax	0		0
Expenses:
Cost of Goods and Services Sold	30,799		92,925
Facility [Member]
Expenses:
Cost of Goods and Services Sold	430,201	$ 456,918	1,315,761	$ 1,338,499
Facility [Member] | As Reported - With Adoption of ASC 606 [Member]
Expenses:
Cost of Goods and Services Sold	430,201		1,315,761
Facility [Member] | As Adjusted - Without Adoption of ASC 606 [Member]
Expenses:
Cost of Goods and Services Sold	430,201		1,315,761
Facility [Member] | Effect of Accounting Change Increase/(Decrease) [Member]
Expenses:
Cost of Goods and Services Sold	$ 0		$ 0