INCOME TAXES - Narrative (Details) - USD ($)		12 Months Ended
Dec. 22, 2017	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
INCOME TAXES
Federal statutory income tax rate (as a percent)	35.00%		21.00%	34.00%
Blended statutory tax rate		30.40%
Impact of federal rate change			$ 467,000
Federal tax credit carryforwards			68,000
Decrease in valuation allowance		$ 217,000
Valuation allowance		871,000	1,088,000
Accrued interest and penalties		$ 0	$ 0

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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