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Note 2 - Investments (Tables) | 9 Months Ended
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Jan. 31, 2017
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 |  | $ | 8,385 |  |  | $ | 431 |  |  | $ | - |  |  | $ | 8,816 |
($ 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 |  | $ | 3,635 |  |  | $ | 2 |  |  | $ | - |  |  | $ | 3,637 |
Due 1 year through 5 years |  |  | 2,500 |  |  |  | - |  |  |  | (8 | ) |  |  | 2,492 |
Total investment in government debt securities |  | $ | 6,135 |  |  | $ | 2 |  |  | $ | (8 | ) |  | $ | 6,129 |
Investment Income [Table Text Block] |
|  | Three Months Ended January 31, |  |  | Nine months ended January 31, |
($ in thousands) |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Dividend income |  | $ | 74 |  |  | $ | 31 |  |  | $ | 147 |  |  | $ | 111 |
Interest income |  |  | 4 |  |  |  | - |  |  |  | 6 |  |  |  | - |
Capital gain distributions |  |  | 39 |  |  |  | 105 |  |  |  | 39 |  |  |  | 105 |
Capital loss |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (15 | )
Other |  |  | 15 |  |  |  | (3 | ) |  |  | 34 |  |  |  | 14 |
Total income from securities transactions, net |  | $ | 132 |  |  | $ | 133 |  |  | $ | 226 |  |  | $ | 215 |
Investment Holdings, Other than Securities [Table Text Block] |
|  | Three Months Ended January 31, |  |  | Nine months ended January 31, |
($ in thousands) (unaudited) |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Investment management fees earned from the Value Line Funds, net of fee waivers |  | $ | 3,674 |  |  | $ | 3,656 |  |  | $ | 10,991 |  |  | $ | 11,147 |
12b-1 fees and other fees, net of fee waivers |  | $ | 1,438 |  |  | $ | 1,440 |  |  | $ | 4,357 |  |  | $ | 4,278 |
Other income (loss) |  | $ | 57 |  |  | $ | (57 | ) |  | $ | 136 |  |  | $ | (84 | )
Investment management fee waivers (1) |  | $ | 132 |  |  | $ | 48 |  |  | $ | 308 |  |  | $ | 143 |
12b-1 fee waivers (1) |  | $ | 235 |  |  | $ | 235 |  |  | $ | 700 |  |  | $ | 848 |
Value Line’s non-voting revenues interest |  | $ | 1,803 |  |  | $ | 1,825 |  |  | $ | 5,389 |  |  | $ | 5,546 |
EAM's net income (2) |  | $ | 262 |  |  | $ | 188 |  |  | $ | 786 |  |  | $ | 710 |
Summary Investment Holdings [Table Text Block] |
|  | January 31, |  |  | April 30, |
($ in thousands) |  | 2017 |  |  | 2016 |
|  | (unaudited) |  |  |  |  |
EAM's total assets |  | $ | 60,354 |  |  | $ | 60,292 |
EAM's total liabilities (1) |  |  | (2,910 | ) |  |  | (3,021 | )
EAM's total equity |  | $ | 57,444 |  |  | $ | 57,271 |

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- Definition Tabular disclosure of investment income, including, but not limited to, interest and dividend income and amortization of discount (premium) derived from debt and equity securities. Excludes realized and unrealized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(a),(b)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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