Note 9 - Income Taxes - Components of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Thousands	Apr. 30, 2023	Apr. 30, 2022
Deferred tax liabilities:
Deferred compensation, restricted stock	$ (166)	$ (358)
Total deferred tax liabilities	(166)	(358)
Deferred tax assets:
Depreciation and amortization	(325)	(1,365)
Research and development	738	0
Accounts receivable allowance	55	55
Inventory and other allowances	74	65
Lease right-to-use	114	472
Compensation accruals	156	60
Jackpot reserves	177	111
Total deferred tax assets	1,639	2,128
Less valuation allowance	0	0
Net deferred tax asset	$ 1,473	$ 1,770