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Investments (Details) - USD ($) $ in Thousands | Apr. 30, 2022 | Apr. 30, 2021
--- | --- | ---
Short-term investments: |  |
Total short-term investments | $ 24,716 | $ 31,971
Long-term investments: |  |
Equity Method Investments. | 15,433 | 7,168
Total long-term investments | 15,433 | 12,156
Investment in limited partnership fund |  |
Long-term investments: |  |
Equity Method Investments. | 15,433 | 7,168
Available-for-sale securities. |  |
Short-term investments: |  |
Total short-term investments | 24,716 | 31,971
Long-term investments: |  |
Total long-term investments |  | 4,988
Available-for-sale securities. | Municipal securities |  |
Short-term investments: |  |
Total short-term investments | 19,725 | 22,245
Long-term investments: |  |
Total long-term investments |  | 988
Available-for-sale securities. | U.S. government securities |  |
Short-term investments: |  |
Total short-term investments | $ 4,991 | 4,009
Long-term investments: |  |
Total long-term investments |  | 4,000
Available-for-sale securities. | Corporate bonds |  |
Short-term investments: |  |
Total short-term investments |  | $ 5,717

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