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Note 7 - Stock Repurchase Program (Tables)
 12 Months Ended
Apr. 30, 2019
Notes Tables  
Class of Treasury Stock [Table Text Block]
Period
  
Total Number
of Shares
Purchased
    
Average
Price Paid
per Share
    
Total Number of Shares
Purchased as Part of
Publicly Announced
Plans or Programs
    
Approximate Dollar
Value of Shares That
May Yet Be
Purchased Under the
Plans or Programs
  
Program authorization
    
 
      
 
      
 
     $
500
  
Shares purchased in prior periods
    
130,346
     $
0.25
      
130,346
     $
468
  
Quarter ended July 31, 2017
    
-
     $
-
      
-
     $
468
  
Quarter ended October 31, 2017
    
8,607
     $
0.30
      
8,607
     $
465
  
Quarter ended January 31, 2018 (a)
    
536,058
     $
0.26
      
536,058
     $
326
  
Quarter ended April 30, 2018 (a)
    
178,526
     $
0.25
      
178,526
     $
281
  
Increase in program authorization April 2018 (b)
    
-
     $
-
      
-
     $
531
  
Quarter ended July 31, 2018 (a)
    
25,277
     $
0.26
      
25,277
     $
525
  
Quarter ended October 31, 2018 (a)
    
480,805
     $
0.30
      
480,805
     $
381
  
Quarter ended January 31, 2019 (a)
    
186,727
     $
0.34
      
186,727
     $
317
  
Quarter ended April 30, 2019 (a)
    
580,705
     $
0.38
      
580,705
     $
94
  
Increase in program authorization April 2019 (c)
    
-
     $
-
      
-
     $
1,569
  
Total
    
2,127,051
     $
0.31
      
2,127,051