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Note 4 - Investments (Tables) | 12 Months Ended
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Apr. 30, 2023
Notes Tables |
Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] |
($ in thousands) |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
ETFs - equities |  | $ | 10,169 |  |  | $ | 4,392 |  |  | $ | (15 | ) |  | $ | 14,546 |
($ in thousands) |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
ETFs - equities |  | $ | 13,318 |  |  | $ | 4,348 |  |  | $ | (19 | ) |  | $ | 17,647 |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | Amortized |  |  | Gross Unrealized |  |  | Gross Unrealized |  |  |  |  |
($ in thousands) |  | Historical Cost |  |  | Holding Gains |  |  | Holding Losses |  |  | Fair Value |
Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due within 1 year |  | $ | 34,384 |  |  | $ | 486 |  |  | $ | (5 | ) |  | $ | 34,865 |
Due within 1 year through 5 years |  |  | 5,071 |  |  |  | - |  |  |  | (8 | ) |  |  | 5,063 |
Total investment in government debt securities |  | $ | 39,455 |  |  | $ | 486 |  |  | $ | (13 | ) |  | $ | 39,928 |
|  | Amortized |  |  | Gross Unrealized |  |  |  |  |
($ in thousands) |  | Historical Cost |  |  | Holding Losses |  |  | Fair Value |
Maturity |  |  |  |  |  |  |  |  |  |  |  |
Due within 1 year |  | $ | 10,505 |  |  | $ | (30 | ) |  | $ | 10,475 |
Total investment in government debt securities |  | $ | 10,505 |  |  | $ | (30 | ) |  | $ | 10,475 |
Investment Income [Table Text Block] |
|  | Fiscal Years Ended April 30, |
($ in thousands) |  | 2023 |  |  | 2022 |  |  | 2021 |
Dividend income |  | $ | 595 |  |  | $ | 851 |  |  | $ | 573 |
Interest income |  |  | 706 |  |  |  | 18 |  |  |  | 137 |
Investment gains/(losses) recognized on sales of equity securities during the period |  |  | (81 | ) |  |  | (1,568 | ) |  |  | 835 |
Unrealized gains/(losses) recognized on equity securities held at the end of the period |  |  | (45 | ) |  |  | 167 |  |  |  | 3,875 |
Other |  |  | (1 | ) |  |  | (2 | ) |  |  | - |
Total investment gains/(losses) |  | $ | 1,174 |  |  | $ | (534 | ) |  | $ | 5,420 |
Investment Holdings, Other than Securities [Table Text Block] |
|  |  |  |  |  | Fiscal Years Ended April 30, |  |  |  |  |
($ in thousands) |  | 2023 |  |  | 2022 |  |  | 2021 |
Investment management fees earned from the Value Line Funds, net of waivers shown below |  | $ | 19,824 |  |  | $ | 29,598 |  |  | $ | 29,022 |
12b-1 fees and other fees, net of waivers shown below |  | $ | 5,964 |  |  | $ | 9,310 |  |  | $ | 9,604 |
Other income/(losses) |  | $ | 142 |  |  | $ | (20 | ) |  | $ | 361 |
Investment management fee waivers and reimbursements |  | $ | 164 |  |  | $ | 547 |  |  | $ | 121 |
12b-1 fee waivers |  | $ | 105 |  |  | $ | 644 |  |  | $ | 651 |
Value Line’s non-voting revenues interest |  | $ | 10,397 |  |  | $ | 15,899 |  |  | $ | 15,190 |
EAM's net income (1) |  | $ | 1,468 |  |  | $ | 4,284 |  |  | $ | 4,262 |
Summary Investment Holdings [Table Text Block] |
|  | Fiscal Years Ended April 30, |
($ in thousands) |  | 2023 |  |  | 2022 |
EAM's total assets |  | $ | 61,389 |  |  | $ | 63,592 |
EAM's total liabilities (1) |  |  | (4,357 | ) |  |  | (6,282 | )
EAM's total equity |  | $ | 57,032 |  |  | $ | 57,310 |

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