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Note 7 - Related Party Transactions (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
Jan. 31, 2016
Oct. 31, 2015
Jul. 31, 2015
Jan. 31, 2017
Jan. 31, 2016
Apr. 30, 2016
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 $ 1,921,000           $ 1,921,000    
Percent of Revenue Interest             100.00%    
Federal Income Tax Payments to Parent             $ 5,250,000 $ 2,695,000  
Ownership Percentage By Parent 88.87%           88.87%    
Value Line Inc [Member]                  
Accounts Receivable, Related Parties $ 0           $ 0   $ 0
Value Line Inc [Member]                  
Reimbursement Revenue             252,000 96,000  
EAM Trust [Member]                  
Assets under Management, Carrying Amount $ 2,300,000     $ 2,100,000     $ 2,300,000 $ 2,100,000  
Percentage of Assets Increased (Decreased) in Unconsolidated Entities             7.40%    
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 49.19% 49.14% 49.45% 50.14% 50.16% 50.05%      
Accrued Non Voting Revenues and Non Voting Profits Interests Payable $ 1,921,000           $ 1,921,000   $ 1,750,000
Percent of Revenue Interest             100.00%    
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%