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Note 4 - Investments (Tables)
 12 Months Ended
Apr. 30, 2017
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
   $
8,385
    $
712
    $
-
    $
9,097
 
($ in thousands)
  
Cost
    
Gross Unrealized Gains
    
Gross Unrealized Losses
    
Fair Value
  
ETFs - equities
   $
3,445
    $
194
    $
(2
 )   $
3,637
 
   
Amortized
   
Gross Unrealized
    
Gross Unrealized
          
($ in thousands)
  
Historical Cost
    
Holding Gains
    
Holding Losses
    
Fair Value
  
Maturity
                                
Due within 1 year
   $
4,384
    $
4
    $
(3
 )   $
4,385
 
Due 1 year through 5 years
    
3,100
     
-
     
(6
 )    
3,094
 
Total investment in government debt securities
   $
7,484
    $
4
    $
(9
 )   $
7,479
 
Investment Income [Table Text Block]
   
Fiscal Years Ended April 30,
  
($ in thousands)
  
2017
    
2016
    
2015
  
Dividend income
   $
193
    $
142
    $
157
 
Interest income
   
33
     
-
     
3
 
Capital gain distribution from ETFs (1)
    
39
     
105
     
57
 
Capital gains (2)
    
-
     
224
     
-
 
Other
    
47
     
6
     
(91
 )
Total income from securities transactions and other, net
   $
312
    $
477
    $
126
 
Investment Holdings, Other than Securities [Table Text Block]
   
Fiscal Years Ended April 30,
  
($ in thousands)
  
2017
    
2016
    
2015
  
Investment management fees earned from the Value Line Funds, net of waivers shown below
   $
14,701
    $
14,548
    $
15,014
 
12b-1 fees and other fees, net of waivers shown below
   $
5,822
    $
5,669
    $
5,459
 
Other income/(loss)
   $
205
    $
(14
 )   $
34
 
Investment management fee waivers and reimbursements (1)
   $
436
    $
262
    $
192
 
12b-1 fee waivers (1)
   $
923
    $
1,071
    $
1,518
 
Value Line’s non-voting revenues interest
   $
7,195
    $
7,211
    $
7,346
 
EAM's net income (2)
   $
1,038
    $
880
    $
1,248
 
Summary Investment Holdings [Table Text Block]
   
Fiscal Years Ended April 30,
  
($ in thousands)
  
2017
    
2016
  
EAM's total assets
   $
60,432
    $
60,292
 
EAM's total liabilities (1)
    
(2,931
 )    
(3,021
 )
EAM's total equity
   $
57,501
    $
57,271