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Income Tax (Details) - USD ($)	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Income Taxes
Domestic	$ 34,274,000	$ 52,730,000	$ 50,644,000
Foreign	91,000	(60,000)	(166,000)
Income before income taxes	34,365,000	52,670,000	50,478,000
Equity method investment loss, net of tax	(10,481,000)	(5,487,000)	(3,944,000)
Income (loss) before income taxes	23,884,000	$ 47,183,000	$ 46,534,000
Deferred tax liabilities for income taxes on undistributed earnings	$ 0

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiary and other recognized entity not within country of domicile. Includes, but is not limited to, other basis differences.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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