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Note 2 - Investments (Tables) | 6 Months Ended
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Oct. 31, 2016
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
($ in thousands) |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
ETFs - equities |  | $ | 8,399 |  |  | $ | 56 |  |  | $ | (83 | ) |  | $ | 8,372 |
($ in thousands) |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
ETFs - equities |  | $ | 3,445 |  |  | $ | 194 |  |  | $ | (2 | ) |  | $ | 3,637 |
|  | Amortized |  |  | Gross Unrealized |  |  | Gross Unrealized |  |  |  |  |
($ in thousands) |  | Historical Cost |  |  | Holding Gains |  |  | Holding Losses |  |  | Fair Value |
Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due within 1 year |  | $ | 3,395 |  |  | $ | 1 |  |  | $ | - |  |  | $ | 3,396 |
Due 1 year through 5 years |  |  | 2,740 |  |  |  | 1 |  |  |  | - |  |  |  | 2,741 |
Total investment in government debt securities |  | $ | 6,135 |  |  | $ | 2 |  |  | $ | - |  |  | $ | 6,137 |
Investment Income [Table Text Block] |
|  | Three Months Ended October 31, |  |  | Six Months Ended October 31, |
($ in thousands) |  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Dividend income |  | $ | 49 |  |  | $ | 38 |  |  | $ | 73 |  |  | $ | 80 |
Interest income |  |  | 2 |  |  |  | - |  |  |  | 2 |  |  |  | - |
Capital loss |  |  | - |  |  |  | (15 | ) |  |  | - |  |  |  | (15 | )
Other |  |  | 10 |  |  |  | 8 |  |  |  | 19 |  |  |  | 17 |
Total income from securities transactions, net |  | $ | 61 |  |  | $ | 31 |  |  | $ | 94 |  |  | $ | 82 |
Investment Holdings, Other than Securities [Table Text Block] |
|  | Three Months Ended October 31, |  |  | Six Months Ended October 31, |
($ in thousands) (unaudited) |  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Investment management fees earned from the Value Line Funds, net of fee waivers |  | $ | 3,680 |  |  | $ | 3,653 |  |  | $ | 7,317 |  |  | $ | 7,491 |
12b-1 fees and other fees, net of fee waivers |  | $ | 1,476 |  |  | $ | 1,442 |  |  | $ | 2,919 |  |  | $ | 2,838 |
Other income (loss) |  | $ | 16 |  |  | $ | (18 | ) |  | $ | 79 |  |  | $ | (27 | )
Investment management fee waivers (1) |  | $ | 95 |  |  | $ | 48 |  |  | $ | 176 |  |  | $ | 95 |
12b-1 fee waivers (1) |  | $ | 232 |  |  | $ | 242 |  |  | $ | 465 |  |  | $ | 613 |
Value Line’s non-voting revenues interest |  | $ | 1,799 |  |  | $ | 1,819 |  |  | $ | 3,586 |  |  | $ | 3,721 |
EAM's net income (2) |  | $ | 266 |  |  | $ | 242 |  |  | $ | 524 |  |  | $ | 522 |
Summary Investment Holdings [Table Text Block] |
|  | October 31, |  |  | April 30, |
($ in thousands) |  | 2016 |  |  | 2016 |
|  | (unaudited) |  |  |  |  |
EAM's total assets |  | $ | 60,789 |  |  | $ | 60,292 |
EAM's total liabilities (1) |  |  | (3,403 | ) |  |  | (3,021 | )
EAM's total equity |  | $ | 57,386 |  |  | $ | 57,271 |

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