Note 7 - Income Taxes - Components of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Apr. 30, 2020
Deferred tax liabilities:
Depreciation and amortization	$ (643)	$ (760)
Deferred compensation, restricted stock	(521)	(196)
Total deferred tax liabilities	(1,164)	(956)
Deferred tax assets:
Accounts receivable allowance	39	39
Inventory and other allowances	187	185
Lease right-to-use	451
Vacation accruals	37	65
Jackpot reserves	50	42
Total deferred tax assets	764	331
Less valuation allowance
Net deferred tax liability	$ (400)	$ (625)