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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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