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Note 1 - Organization and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Apr. 30, 2024
Notes Tables |
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] |
|  | 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 |
|  | As of April 30, 2023 |
($ in thousands) |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Cash equivalents |  | $ | 7,240 |  |  | $ | - |  |  | $ | - |  |  | $ | 7,240 |
Equity securities |  |  | 14,546 |  |  |  | - |  |  |  | - |  |  |  | 14,546 |
Available-for-sale fixed income securities |  |  | 39,178 |  |  |  | 750 |  |  |  | - |  |  |  | 39,928 |
|  | $ | 60,964 |  |  | $ | 750 |  |  | $ | - |  |  | $ | 61,714 |

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