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Investments (Tables) | 12 Months Ended
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Apr. 30, 2023
Investments |
Schedule of investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | April 30,
​ |  | 2023 |  | 2022
​ | ​ | (In thousands)
Short-term investments: | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale securities: | ​ | ​ | ​ | ​ | ​ | ​
Municipal securities | ​ | ​ | — | ​ | ​ | 19,725
U.S. government securities | ​ | ​ | — | ​ | ​ | 4,991
Total short-term investments | ​ | $ | — | ​ | $ | 24,716
Long-term investments: | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale securities: | ​ | ​ | ​ | ​ | ​ | ​
Equity securities and warrants | ​ | ​ | 4,969 | ​ | ​ | —
Total long-term available-for-sale securities investments | ​ |  | 4,969 | ​ |  | —
Equity method investments | ​ | ​ | ​ | ​ | ​ | ​
Investments in limited partnership funds | ​ |  | 18,644 | ​ |  | 15,433
Total equity method investments | ​ |  | 18,644 | ​ |  | 15,433
Total long-term investments | ​ | $ | 23,613 | ​ | $ | 15,433
Schedule of activity related to available-for-sale investments recorded in short-term | The following table is a summary of the activity related to the available-for-sale debt securities recorded in short-term investments as of April 30, 2022, respectively (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ |  |
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair | ​ | ​
​ | ​ | Cost |  | Gains | ​ | Losses |  | Value | ​ | ​
Municipal securities | ​ | $ | 19,756 | ​ | $ | — | ​ | $ | (31) | ​ | $ | 19,725 | ​ | ​
U.S. government securities | ​ | ​ | 4,995 | ​ | ​ | — | ​ | ​ | (4) | ​ | ​ | 4,991 | ​ | ​
Total available-for-sale equity securities | ​ | $ | 24,751 | ​ | $ | — | ​ | $ | (35) | ​ | $ | 24,716 | ​ | ​
Schedule of amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of available-for-sale investments | ​
​ | ​ | ​ | ​
​ | ​ | Year Ended
​ |  | April 30,
​ | ​ | 2023
Net loss recognized during the period on equity securities | ​ | $ | (132)
Less: Net loss recognized during the period on equity securities sold during the period | ​ | ​ | —
Unrealized loss recognized during the period on equity securities still held at the reporting date | ​ | $ | (132)

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- Definition Tabular disclosure of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714 + Details
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- Definition Tabular disclosure of the summary of investment holdings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B) -URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010 + Details
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