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Note 1 - Organization and Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Jul. 31, 2024
Notes Tables |
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] |
|  | As of July 31, 2024 |
($ in thousands) |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Cash equivalents |  | $ | 15,248 |  |  | $ | - |  |  | $ | - |  |  | $ | 15,248 |
Equity securities |  |  | 21,724 |  |  |  | - |  |  |  | - |  |  |  | 21,724 |
Available-for-sale fixed income securities |  |  | 33,928 |  |  |  | - |  |  |  | - |  |  |  | 33,928 |
|  | $ | 70,900 |  |  | $ | - |  |  | $ | - |  |  | $ | 70,900 |
|  | As of April 30, 2024 |
($ in thousands) |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Cash equivalents |  | $ | 4,136 |  |  | $ | - |  |  | $ | - |  |  | $ | 4,136 |
Equity securities |  |  | 16,344 |  |  |  | - |  |  |  | - |  |  |  | 16,344 |
Available-for-sale fixed income securities |  |  | 47,361 |  |  |  | 250 |  |  |  | - |  |  |  | 47,611 |
|  | $ | 67,841 |  |  | $ | 250 |  |  | $ | - |  |  | $ | 68,091 |

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