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Note 3 - Related Party Transactions (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2015
Apr. 30, 2016
Jan. 31, 2016
Oct. 31, 2015
Jul. 31, 2015
Apr. 30, 2015
Jan. 31, 2015
Oct. 31, 2014
Jul. 31, 2014
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2014
EAM Trust [Member] | Value Line Inc [Member]                        
Value of Fund $ 2,000,000,000                      
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   $ 2,200,000,000       $ 2,400,000,000       $ 2,200,000,000 $ 2,400,000,000  
Increase (Decrease) in Assets under Management                   $ 128,000,000    
Percentage of Assets Increased (Decreased) in Unconsolidated Entities                   5.40%    
Non Voting Profits Interest Percent                   50.00%    
Percentage of Non Voting Revenues Interest in Unconsolidated Entity   49.97% 50.14% 50.16% 50.05% 49.87% 49.80% 49.63% 49.18%      
Non Voting Profits Interest in Variable Entity Not yet Paid   $ 1,750,000       $ 1,951,000       $ 1,750,000 1,951,000  
Ownership Percentage By Parent   88.50%               88.50%    
Value Line Inc [Member]                        
Reimbursement Revenue                   $ 164,000 171,000  
Federal Income Tax Payments to Parent                   $ 3,545,000 $ 3,366,000 $ 2,254,000