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Note 7 - Related Party Transactions (Details Textual) - USD ($) | 2 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Oct. 31, 2016 | Jul. 31, 2016 | Jul. 31, 2015 | Apr. 30, 2016
EAM Trust [Member] | Minimum [Member] |  |  |  |
Non Voting Revenues Interest Percent |  | 41.00% |  |
Percentage of Non Voting Profits Interests Due from Ex Subsidiary Payable to Parent under Agreement |  | 90.00% |  |
EAM Trust [Member] | Maximum [Member] |  |  |  |
Non Voting Revenues Interest Percent |  | 55.00% |  |
EAM Trust [Member] |  |  |  |
Assets under Management, Carrying Amount |  | $ 2,320,000,000 | $ 2,350,000,000 |
Percentage of Assets Increased (Decreased) in Unconsolidated Entities |  | 1.40% |  |
Non Voting Profits Interest Percent |  | 50.00% |  |
NonVotingProfitsInterest, Remaining Percentage | 50.00% |  |  |
Percentage of Non Voting Profits Interests Due from Ex Subsidiary Payable to Parent under Agreement |  | 90.00% |  |
Percentage of Non Voting Revenues Interest in Unconsolidated Entity |  | 49.45% | 50.05% |
Accrued Non Voting Revenues and Non Voting Profits Interests Payable |  | $ 1,903,000 |  | $ 1,750,000
Percent of Revenue Interest |  | 100.00% |  |
Ownership Percentage By Parent |  | 88.80% |  |
Value Line Inc [Member] |  |  |  |
Reimbursement Revenue |  | $ 84,000 | $ 31,000 |
Federal Income Tax Payments to Parent |  | $ 268,000 | $ 0 |
Percentage of Non Voting Profits Interests Due from Ex Subsidiary Payable to Parent under Agreement |  | 90.00% |  |
Accrued Non Voting Revenues and Non Voting Profits Interests Payable |  | $ 1,903,000 |  |
Percent of Revenue Interest |  | 100.00% |  |

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