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Note 2 - Investments (Tables) | 9 Months Ended
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Jan. 31, 2018
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
($ in thousands) |  | Cost |  |  | Gross Unrealized Gains |  |  | Fair Value |
ETFs - equities |  | $ | 8,385 |  |  | $ | 1,541 |  |  | $ | 9,926 |
($ in thousands) |  | Cost |  |  | Gross Unrealized Gains |  |  | Fair Value |
ETFs - equities |  | $ | 8,385 |  |  | $ | 712 |  |  | $ | 9,097 |
|  | Amortized |  |  | Gross Unrealized |  |  | Gross Unrealized |  |  |  |  |
($ in thousands) |  | Historical Cost |  |  | Holding Gains |  |  | Holding Losses |  |  | Fair Value |
Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due within 1 year |  | $ | 7,136 |  |  | $ | 5 |  |  | $ | (8 | ) |  | $ | 7,133 |
Due 1 year through 5 years |  |  | 1,350 |  |  |  | - |  |  |  | (5 | ) |  |  | 1,345 |
Total investment in government debt securities |  | $ | 8,486 |  |  | $ | 5 |  |  | $ | (13 | ) |  | $ | 8,478 |
|  | Amortized |  |  | Gross Unrealized |  |  | Gross Unrealized |  |  |  |  |
($ in thousands) |  | Historical Cost |  |  | Holding Gains |  |  | Holding Losses |  |  | Fair Value |
Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due within 1 year |  | $ | 4,384 |  |  | $ | 4 |  |  | $ | (3 | ) |  | $ | 4,385 |
Due 1 year through 5 years |  |  | 3,100 |  |  |  | - |  |  |  | (6 | ) |  |  | 3,094 |
Total investment in government debt securities |  | $ | 7,484 |  |  | $ | 4 |  |  | $ | (9 | ) |  | $ | 7,479 |
Investment Income [Table Text Block] |
|  | Three Months Ended January 31, |  |  | Nine Months Ended January 31, |
($ in thousands) |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Dividend income |  | $ | 66 |  |  | $ | 74 |  |  | $ | 170 |  |  | $ | 147 |
Interest income |  |  | 25 |  |  |  | 4 |  |  |  | 75 |  |  |  | 6 |
Capital gain distributions |  |  | 152 |  |  |  | 39 |  |  |  | 152 |  |  |  | 39 |
Other |  |  | 15 |  |  |  | 15 |  |  |  | 48 |  |  |  | 34 |
Total income from securities transactions, net |  | $ | 258 |  |  | $ | 132 |  |  | $ | 445 |  |  | $ | 226 |
Investment Holdings, Other than Securities [Table Text Block] |
|  | Three Months Ended January 31, |  |  | Nine Months Ended January 31, |
($ in thousands) (unaudited) |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Investment management fees earned from the Value Line Funds, net of fee waivers |  | $ | 4,070 |  |  | $ | 3,674 |  |  | $ | 12,096 |  |  | $ | 10,991 |
12b-1 fees and other fees, net of fee waivers |  | $ | 1,676 |  |  | $ | 1,438 |  |  | $ | 4,844 |  |  | $ | 4,357 |
Other income |  | $ | 52 |  |  | $ | 57 |  |  | $ | 156 |  |  | $ | 136 |
Investment management fee waivers |  | $ | 131 |  |  | $ | 132 |  |  | $ | 392 |  |  | $ | 308 |
12b-1 fee waivers |  | $ | 169 |  |  | $ | 235 |  |  | $ | 583 |  |  | $ | 700 |
Value Line ’s non-voting revenues interest |  | $ | 2,057 |  |  | $ | 1,803 |  |  | $ | 6,074 |  |  | $ | 5,389 |
EAM's net income (1) |  | $ | 514 |  |  | $ | 262 |  |  | $ | 1,166 |  |  | $ | 786 |
Summary Investment Holdings [Table Text Block] |
|  | January 31, |  |  | April 30, |
($ in thousands) |  | 2018 |  |  | 2017 |
|  | (unaudited) |  |  |  |  |
EAM's total assets |  | $ | 60,666 |  |  | $ | 60,432 |
EAM's total liabilities (1) |  |  | (3,655 | ) |  |  | (2,931 | )
EAM's total equity |  | $ | 57,011 |  |  | $ | 57,501 |

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