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Note 4 - Investments (Tables) | 12 Months Ended
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Apr. 30, 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 |  |  | $ | 194 |  |  | $ | (2 | ) |  | $ | 3,637 |
($ in thousands) |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Common stocks |  | $ | 101 |  |  | $ | 74 |  |  | $ | - |  |  | $ | 175 |
ETFs - equities |  |  | 3,903 |  |  |  | 1,508 |  |  |  | - |  |  |  | 5,411 |
Inverse ETFs - equities |  |  | 5,466 |  |  |  | - |  |  |  | (1,420 | ) |  |  | 4,046 |
|  | $ | 9,470 |  |  | $ | 1,582 |  |  | $ | (1,420 | ) |  | $ | 9,632 |
Investment Income [Table Text Block] |
|  | Fiscal Years Ended April 30, |
($ in thousands) |  | 2016 |  |  | 2015 |  |  | 2014 |
Dividend income |  | $ | 142 |  |  | $ | 157 |  |  | $ | 147 |
Interest income |  |  | - |  |  |  | 3 |  |  |  | 5 |
Capital gain distribution from ETFs (1) |  |  | 105 |  |  |  | 57 |  |  |  | 36 |
Exchange loss |  |  | (2 | ) |  |  | (16 | ) |  |  | - |
Interest expense |  |  | - |  |  |  | - |  |  |  | (5 | )
Capital gains (2) |  |  | 224 |  |  |  | - |  |  |  | - |
Other |  |  | 8 |  |  |  | (75 | ) |  |  | (5 | )
Total income/(loss) from securities transactions and other, net |  | $ | 477 |  |  | $ | 126 |  |  | $ | 178 |
Investment Holdings, Other than Securities [Table Text Block] |
|  | Fiscal Years Ended April 30, |
($ in thousands) |  | 2016 |  |  | 2015 |  |  | 2014 |
Investment management fees earned from the Value Line Funds, net of waivers shown below |  | $ | 14,548 |  |  | $ | 15,014 |  |  | $ | 14,452 |
12b-1 fees and other fees, net of waivers shown below |  | $ | 5,669 |  |  | $ | 5,459 |  |  | $ | 5,061 |
Other income |  | $ | (14 | ) |  | $ | 34 |  |  | $ | 16 |
Investment management fee waivers and reimbursements (1) |  | $ | 262 |  |  | $ | 192 |  |  | $ | 89 |
12b-1 fee waivers (1) |  | $ | 1,071 |  |  | $ | 1,518 |  |  | $ | 1,683 |
Value Line’s non-voting revenues interest |  | $ | 7,211 |  |  | $ | 7,346 |  |  | $ | 6,767 |
EAM's net income (2) |  | $ | 880 |  |  | $ | 1,248 |  |  | $ | 1,464 |
Summary Investment Holdings [Table Text Block] |
|  | Fiscal Years Ended April 30, |
($ in thousands) |  | 2016 |  |  | 2015 |
EAM's total assets |  | $ | 60,292 |  |  | $ | 60,159 |
EAM's total liabilities (1) |  |  | (3,021 | ) |  |  | (3,104 | )
EAM's total equity |  | $ | 57,271 |  |  | $ | 57,055 |

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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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