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Investments (Details) - USD ($) $ in Thousands | Oct. 31, 2020 | Apr. 30, 2020
--- | --- | ---
Short-term investments: |  |
Total short-term investments | $ 67,137 | $ 47,507
Long-term investments: |  |
Equity Method Investments. | 5,335 | 4,442
Total long-term investments | 20,976 | 15,030
Investment in limited partnership fund |  |
Long-term investments: |  |
Equity Method Investments. | 5,335 | 4,442
Available-for-sale securities |  |
Short-term investments: |  |
Total short-term investments | 67,137 | 47,507
Long-term investments: |  |
Total long-term investments | 15,641 | 10,588
Available-for-sale securities | Municipal securities |  |
Short-term investments: |  |
Total short-term investments | 13,279 | 5,244
Long-term investments: |  |
Total long-term investments | 5,640 | 1,592
Available-for-sale securities | U.S. government securities |  |
Short-term investments: |  |
Total short-term investments | 44,024 | 33,771
Long-term investments: |  |
Total long-term investments | 10,001 | 8,996
Available-for-sale securities | Corporate bonds |  |
Short-term investments: |  |
Total short-term investments | $ 9,834 | $ 8,492

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