Note 4 - Income Taxes - Components of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Apr. 30, 2019
Deferred tax liabilities:
Depreciation and amortization	$ (760)	$ (923)
Deferred compensation, restricted stock	(196)	(257)
Total deferred tax liabilities	(956)	(1,180)
Deferred tax assets:
Accounts receivable allowance	39	39
Inventory and other allowances	185	194
Vacation accruals	65	25
Jackpot reserves	42	37
Total deferred tax assets	331	295
Less valuation allowance
Net deferred tax liability	$ (625)	$ (885)