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Note 2 - Investments (Tables)
9 Months Ended
Jan. 31, 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
    $
431
    $
-
    $
8,816
 
($ 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
  $
3,635
    $
2
    $
-
    $
3,637
 
Due 1 year through 5 years
   
2,500
     
-
     
(8
)    
2,492
 
Total investment in government debt securities
  $
6,135
    $
2
    $
(8
)   $
6,129
 
Investment Income [Table Text Block]
   
Three Months Ended January 31,
   
Nine months ended January 31,
 
($ in thousands)
 
2017
   
2016
   
2017
   
2016
 
Dividend income
  $
74
    $
31
    $
147
    $
111
 
Interest income
   
4
     
-
     
6
     
-
 
Capital gain distributions
   
39
     
105
     
39
     
105
 
Capital loss
   
-
     
-
     
-
     
(15
)
Other
   
15
     
(3
)    
34
     
14
 
Total income from securities transactions, net
  $
132
    $
133
    $
226
    $
215
 
Investment Holdings, Other than Securities [Table Text Block]
   
Three Months Ended January 31,
   
Nine months ended January 31,
 
($ in thousands) (unaudited)
 
2017
   
2016
   
2017
   
2016
 
Investment management fees earned from the Value Line Funds, net of fee waivers
  $
3,674
    $
3,656
    $
10,991
    $
11,147
 
12b-1 fees and other fees, net of fee waivers
  $
1,438
    $
1,440
    $
4,357
    $
4,278
 
Other income (loss)
  $
57
    $
(57
)   $
136
    $
(84
)
Investment management fee waivers (1)
  $
132
    $
48
    $
308
    $
143
 
12b-1 fee waivers (1)
  $
235
    $
235
    $
700
    $
848
 
Value Line’s non-voting revenues interest
  $
1,803
    $
1,825
    $
5,389
    $
5,546
 
EAM's net income (2)
  $
262
    $
188
    $
786
    $
710
 
Summary Investment Holdings [Table Text Block]
   
January 31,
   
April 30,
 
($ in thousands)
 
2017
   
2016
 
   
(unaudited)
         
EAM's total assets
  $
60,354
    $
60,292
 
EAM's total liabilities (1)
   
(2,910
)    
(3,021
)
EAM's total equity
  $
57,444
    $
57,271