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Note 4 - Investments (Tables)
12 Months Ended
Apr. 30, 2021
Notes Tables  
Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block]
($ in thousands)
 
Cost
   
Gross Unrealized Gains
   
Gross Unrealized Losses
   
Fair Value
 
ETFs - equities
  $
19,105
    $
4,532
    $
(55
)   $
23,582
 
($ in thousands)
 
Cost
   
Gross Unrealized Gains
   
Gross Unrealized Losses
   
Fair Value
 
ETFs - equities
  $
12,877
    $
1,317
    $
(69
)   $
14,125
 
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
Amortized
   
Gross Unrealized
         
($ in thousands)
 
Historical Cost
   
Holding Gains
   
Fair Value
 
Maturity
                       
Due within 1 year
  $
2,596
    $
4
    $
2,600
 
Total investment in government debt securities
  $
2,596
    $
4
    $
2,600
 
   
Amortized
   
Gross Unrealized
         
($ in thousands)
 
Historical Cost
   
Holding Gains
   
Fair Value
 
Maturity
                       
Due within 1 year
  $
14,652
    $
177
    $
14,829
 
Due 1 year through 5 years
   
250
     
-
     
250
 
Total investment in government debt securities
  $
14,902
    $
177
    $
15,079
 
Investment Income [Table Text Block]
   
Fiscal Years Ended April 30,
 
($ in thousands)
 
2021
   
2020
   
2019
 
Dividend income
  $
573
    $
352
    $
257
 
Interest income
   
137
     
279
     
201
 
Investment gains/(losses) recognized on sales of equity securities during the period
   
835
     
(1,075
)    
-
 
Unrealized gains/(losses) recognized on equity securities held at the end of the period
   
3,875
     
(339
)    
1,087
 
Other
   
-
     
(6
)    
46
 
Total investment gains/(losses)   $
5,420
    $
(789
)   $
1,591
 
Investment Holdings, Other than Securities [Table Text Block]
     
Fiscal Years Ended April 30,
 
($ in thousands)
 
2021
   
2020
   
2019
 
Investment management fees earned from the Value Line Funds, net of waivers shown below
  $
29,022
    $
21,985
    $
16,715
 
12b-1 fees and other fees, net of waivers shown below
  $
9,604
    $
8,436
    $
6,811
 
Other income
  $
361
    $
(156
)   $
273
 
Investment management fee waivers and reimbursements
  $
121
    $
302
    $
421
 
12b-1 fee waivers
  $
651
    $
667
    $
654
 
Value Line's non-voting revenues interest
  $
15,190
    $
11,184
    $
8,260
 
EAM's net income (1)
  $
4,262
    $
2,332
    $
2,098
 
Summary Investment Holdings [Table Text Block]
   
Fiscal Years Ended April 30,
 
($ in thousands)
 
2021
   
2020
 
EAM's total assets
  $
64,197
    $
61,335
 
EAM's total liabilities (1)
   
(6,870
)    
(4,192
)
EAM's total equity
  $
57,327
    $
57,143