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Note 2 - Investments (Tables) | 9 Months Ended
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Jan. 31, 2022
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 |  | $ | 22,746 |  |  | $ | 4,724 |  |  | $ | (154 | ) |  | $ | 27,316 |
($ in thousands) |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
ETFs - equities |  | $ | 19,105 |  |  | $ | 4,532 |  |  | $ | (55 | ) |  | $ | 23,582 |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
($ in thousands) |  | Amortized Historical Cost |  |  | Gross Unrealized Holding Losses |  |  | Fair Value |
Maturity |  |  |  |  |  |  |  |  |  |  |  |
Due within 1 year |  | $ | 598 |  |  | $ | (1 | ) |  | $ | 597 |
Total investment in government debt securities |  | $ | 598 |  |  | $ | (1 | ) |  | $ | 597 |
($ in thousands) |  | Amortized Historical Cost |  |  | Gross Unrealized Holding Gains |  |  | Fair Value |
Maturity |  |  |  |  |  |  |  |  |  |  |  |
Due within 1 year |  | $ | 2,596 |  |  | $ | 4 |  |  | $ | 2,600 |
Total investment in government debt securities |  | $ | 2,596 |  |  | $ | 4 |  |  | $ | 2,600 |
Investment Income [Table Text Block] |
|  | Three Months Ended January 31, |  |  | Nine Months Ended January 31, |
($ in thousands) |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Dividend income |  | $ | 234 |  |  | $ | 155 |  |  | $ | 640 |  |  | $ | 413 |
Interest income |  |  | (2 | ) |  |  | 31 |  |  |  | (1 | ) |  |  | 131 |
Investment gains/(losses) recognized on sales of equity securities during the period |  | $ | (19 | ) |  | $ | 141 |  |  |  | 28 |  |  |  | 585 |
Unrealized gains/(losses) recognized on equity securities held at the end of the period |  | $ | (215 | ) |  | $ | 1,456 |  |  |  | 94 |  |  |  | 1,964 |
Other |  |  | (1 | ) |  |  | 2 |  |  |  | (2 | ) |  |  | - |
Total investment gains/(losses) |  | $ | (3 | ) |  | $ | 1,785 |  |  | $ | 759 |  |  | $ | 3,093 |
Investment Holdings, Other than Securities [Table Text Block] |
|  | Three Months Ended January 31, |  |  | Nine Months Ended January 31, |
($ in thousands) (unaudited) |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Investment management fees earned from the Value Line Funds, net of waivers shown below |  | $ | 7,627 |  |  | $ | 7,827 |  |  | $ | 23,306 |  |  | $ | 21,318 |
12b-1 fees and other fees, net of waivers shown below |  | $ | 2,362 |  |  | $ | 2,439 |  |  | $ | 7,303 |  |  | $ | 7,194 |
Other income/(loss) |  | $ | (70 | ) |  | $ | 119 |  |  | $ | 49 |  |  | $ | 234 |
Investment management fee waivers and reimbursements |  | $ | 184 |  |  | $ | 88 |  |  | $ | 402 |  |  | $ | 207 |
12b-1 fee waivers |  | $ | 151 |  |  | $ | 168 |  |  | $ | 493 |  |  | $ | 490 |
Value Line’s non-voting revenues interest |  | $ | 4,120 |  |  | $ | 4,104 |  |  | $ | 12,532 |  |  | $ | 11,113 |
EAM's net income (1) |  | $ | 1,070 |  |  | $ | 1,260 |  |  | $ | 3,640 |  |  | $ | 2,958 |
Summary Investment Holdings [Table Text Block] |
|  | January 31, |  |  | April 30, |
($ in thousands) |  | 2022 |  |  | 2021 |
|  | (unaudited) |  |  |  |  |
EAM's total assets |  | $ | 65,144 |  |  | $ | 64,197 |
EAM's total liabilities (1) |  |  | (7,910 | ) |  |  | (6,870 | )
EAM's total equity |  | $ | 57,234 |  |  | $ | 57,327 |

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