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Investments in Companies Accounted for Using the Equity Methods - Investment in Limited Partnership Fund (Details) - USD ($)				1 Months Ended	12 Months Ended
	Mar. 24, 2021	Jan. 04, 2021	Jul. 15, 2020	Jul. 31, 2019	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Equity Method Investments
Equity method investment loss, net of tax					$ (10,481,000)	$ (5,487,000)	$ (3,944,000)
Provision for income taxes					539,000	5,848,000	4,641,000
Carrying value of investment					7,168,000	4,442,000
Limited Partnership Fund
Equity Method Investments
Capital contributions	$ 525,000	$ 977,000	$ 1,173,000	$ 2,377,000
Equity method investment loss, net of tax					(49,000)	394,000
Provision for income taxes					11,000	111,000
Limited Partnership Fund | Long term investments
Equity Method Investments
Carrying value of investment					7,168,000	4,442,000
HAPSMobile | Equity method investment loss, net of tax
Equity Method Investments
Equity method investment loss, net of tax					$ 10,530,000	$ 4,982,000	$ 3,944,000

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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