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Note 2 - Investments (Tables) | 3 Months Ended
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Jul. 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 |  | $ | 3,445 |  |  | $ | 430 |  |  | $ | - |  |  | $ | 3,875 |
($ in thousands) |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
ETFs - equities |  | $ | 3,445 |  |  | $ | 194 |  |  | $ | (2 | ) |  | $ | 3,637 |
Investment Income [Table Text Block] |
|  | Three Months Ended July 31, |
($ in thousands) |  | 2016 |  |  | 2015 |
Dividend income |  | $ | 24 |  |  | $ | 43 |
Interest income |  |  | - |  |  |  | - |
Other |  |  | 9 |  |  |  | 8 |
Total income from securities transactions, net |  | $ | 33 |  |  | $ | 51 |
Investment Holdings, Other than Securities [Table Text Block] |
|  | Three Months Ended July 31, |
($ in thousands) (unaudited) |  | 2016 |  |  | 2015 |
Investment management fees earned from the Value Line Funds, net of fee waivers |  | $ | 3,637 |  |  | $ | 3,838 |
12b-1 fees and other fees, net of fee waivers |  | $ | 1,443 |  |  | $ | 1,396 |
Other income (loss) |  | $ | 63 |  |  | $ | (9 | )
Investment management fee waivers (1) |  | $ | 81 |  |  | $ | 47 |
12b-1 fee waivers (1) |  | $ | 233 |  |  | $ | 371 |
Value Line’s non-voting revenues interest |  | $ | 1,787 |  |  | $ | 1,902 |
EAM's net income (2) |  | $ | 258 |  |  | $ | 280 |
Summary Investment Holdings [Table Text Block] |
|  | July 31, |  |  | April 30, |
($ in thousands) |  | 2016 |  |  | 2016 |
|  | (unaudited) |  |  |  |  |
EAM's total assets |  | $ | 60,955 |  |  | $ | 60,292 |
EAM's total liabilities (1) |  |  | (3,627 | ) |  |  | (3,021 | )
EAM's total equity |  | $ | 57,328 |  |  | $ | 57,271 |

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- Definition Tabular disclosure of the investment holdings which are represented by other than securities (for example, commodities). The investment holdings, other than securities investments table lists the long positions of non-security investments held by entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5 -Subparagraph (SX 210.12-13) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611282-123010 + Details
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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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