Note 4 - Income Taxes - Components of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Thousands	Apr. 30, 2019	Apr. 30, 2018
Deferred tax liabilities:
Depreciation and amortization	$ (923)	$ (112)
Deferred compensation, restricted stock	(257)
Total deferred tax liabilities	(1,180)	(112)
Deferred tax assets:
Accounts receivable allowance	39	30
Inventory and other allowances	194	154
Vacation accruals	25	31
Jackpot reserves	37	26
R&D credits		64
Total deferred tax assets	295	305
Less valuation allowance
Net deferred tax assets (liabilities)	$ (885)
Net deferred tax assets (liabilities)		$ 193