Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Jan. 31, 2022	Jan. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ (10,612)	$ (980)
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	3,896	4,577
Forgiveness of debt	(2,001)	0
Deferred income tax expense	234	0
Deferred compensation, restricted stock	456	449
Gain on sale of airplane	(75)	0
Changes in operating assets and liabilities
Accounts receivable	(211)	(198)
Inventories	(81)	(382)
Contract assets	(1,191)	(870)
Prepaid expenses and other current assets	208	(116)
Accounts payable	419	1,028
Contract liability	(4,742)	3,133
Lease liability	0	(659)
Accrued liabilities	(126)	(875)
Gaming facility mandated payment	(117)	(292)
Income tax payable	1,153	(85)
Other current liabilities	209	196
Net cash provided by operating activities	8,643	6,886
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(5,312)	(5,351)
Proceeds from sale of airplane	75	0
Net cash used in investing activities	(5,237)	(5,351)
CASH FLOWS FROM FINANCING ACTIVITIES
Borrowings of long-term debt		2,479
Repayments of long-term debt	(3,127)	(2,297)
Repurchase of common stock	(4)	(185)
Payments on lease liability	(82)	(104)
Net cash used in financing activities	(10,872)	(107)
NET INCREASE (DECREASE) IN CASH	(7,466)	1,428
CASH, beginning of period	22,022	16,793
CASH, end of period	14,556	18,221
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Interest paid	1,980	2,397
Income taxes paid	1,265	385
NON CASH INVESTING AND FINANCING ACTIVITY
Secured notes payable for purchase of noncontrolling interest in BHCMC, LLC, net	7,914
Notes receivable forgiven as part of purchase of noncontrolling interest in BHCMC, LLC	780
Deferred tax asset relating to the purchase of noncontrolling interest in BHCMC, LCC	2,344	0
Purchase of noncontrolling interest	6,350
Secured notes payable for purchase of leased assets, net		41,205
Lease right-of-use assets purchased		38,622
Lease liability for purchase of assets under lease		$ 39,709
BHCMC, LLC [Member]
CASH FLOWS FROM FINANCING ACTIVITIES
Purchase of noncontrolling interest in BHCMC, LLC	$ (7,659)