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Note 2 - Investments (Tables)
6 Months Ended
Oct. 31, 2019
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
           
Gross Unrealized
         
($ in thousands)
 
Cost
   
Holding Gains
   
Fair Value
 
ETFs - equities
  $
9,447
    $
2,485
    $
11,932
 
           
Gross Unrealized
         
($ in thousands)
 
Cost
   
Holding Gains
   
Fair Value
 
ETFs - equities
  $
8,541
    $
2,081
    $
10,622
 
   
Amortized
   
Gross Unrealized
         
($ in thousands)
 
Historical Cost
   
Holding Gains
   
Fair Value
 
Maturity
                       
Due within 1 year
  $
7,411
    $
80
    $
7,491
 
Due 1 year through 5 years
   
2,250
     
17
     
2,267
 
Total investment in government debt securities
  $
9,661
    $
97
    $
9,758
 
   
Amortized
   
Gross Unrealized
         
($ in thousands)
 
Historical Cost
   
Holding Gains
   
Fair Value
 
Maturity
                       
Due within 1 year
  $
6,913
    $
33
    $
6,946
 
Due 1 year through 5 years
   
4,250
     
10
     
4,260
 
Total investment in government debt securities
  $
11,163
    $
43
    $
11,206
 
Investment Income [Table Text Block]
   
Three Months Ended October 31,
   
Six Months Ended October 31,
 
($ in thousands)
 
2019
   
2018
   
2019
   
2018
 
Dividend income
  $
81
    $
62
    $
151
    $
129
 
Interest income
   
66
     
49
     
137
     
84
 
Other
   
(4
)    
12
     
(4
)    
24
 
Total income from securities transactions, net
  $
143
    $
123
    $
284
    $
237
 
Investment Holdings, Other than Securities [Table Text Block]
   
Three Months Ended October 31,
   
Six Months Ended October 31,
 
($ in thousands) (unaudited)
 
2019
   
2018
   
2019
   
2018
 
Investment management fees earned from the Value Line Funds, net of waivers shown below
  $
5,463
    $
4,181
    $
10,610
    $
8,290
 
12b-1 fees and other fees, net of waivers shown below
  $
2,086
    $
1,727
    $
4,065
    $
3,431
 
Other income
  $
5
    $
(27
)   $
58
    $
44
 
Investment management fee waivers and reimbursements
  $
109
    $
110
    $
218
    $
221
 
12b-1 fee waivers
  $
166
    $
175
    $
339
    $
334
 
Value Line’s non-voting revenues interest
  $
2,768
    $
2,095
    $
5,356
    $
4,063
 
EAM's net income (1)
  $
580
    $
578
    $
1,146
    $
1,184
 
Summary Investment Holdings [Table Text Block]
   
October 31,
   
April 30,
 
($ in thousands)
 
2019
   
2019
 
   
(unaudited)
         
EAM's total assets
  $
61,701
    $
60,683
 
EAM's total liabilities (1)
   
(4,723
)    
(3,547
)
EAM's total equity
  $
56,978
    $
57,136