Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 7,928	$ 48
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	2,631	3,250
Forgiveness of debt	(2,001)	0
Deferred income tax expense	234	0
Deferred compensation, restricted stock	297	300
Gain on sale of airplane	(75)	0
Changes in operating assets and liabilities
Accounts receivable	(1,605)	514
Income tax receivable	0	(65)
Inventories	109	(893)
Contract assets	(680)	(353)
Prepaid expenses and other current assets	(296)	(456)
Accounts payable	850	793
Contract liability	(4,553)	2,141
Lease liability	(57)	(559)
Accrued liabilities	(32)	(721)
Gaming facility mandated payment	100	64
Income tax payable	710	(206)
Other liabilities	175	143
Net cash provided by operating activities	3,735	4,000
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(3,381)	(3,401)
Proceeds from sale of airplane	75	0
Net cash used in investing activities	(3,306)	(3,401)
CASH FLOWS FROM FINANCING ACTIVITIES
Borrowings of long-term debt	0	2,001
Repayments of long-term debt	(1,863)	(1,804)
Repurchase of common stock	(4)	(185)
Net cash provided by (used in) financing activities	(9,526)	12
NET INCREASE (DECREASE) IN CASH	(9,097)	611
CASH, beginning of period	22,022	16,793
CASH, end of period	12,925	17,404
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Interest paid	1,253	1,644
Income taxes paid	715	385
NON CASH INVESTING AND FINANCING ACTIVITY
Secured notes payable for purchase of noncontrolling interest in BHCMC, LLC, net	7,914	0
Notes receivable forgiven as part of purchase of noncontrolling interest in BHCMC, LLC	780	0
Deferred tax asset relating to the purchase of noncontrolling interest in BHCMC, LCC	2,344	0
Purchase of noncontrolling interest	6,350	0
BHCMC, LLC [Member]
CASH FLOWS FROM FINANCING ACTIVITIES
Purchase of noncontrolling interest in BHCMC, LLC	$ (7,659)	$ 0