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Note 7 - Stock Repurchase Program (Tables)
 12 Months Ended
Apr. 30, 2020
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
    
853,537
     $
0.26
      
853,537
     $
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
  
Quarter ended July 31, 2019 (a)
    
120,821
     $
0.35
      
120,821
     $
1,526
  
Increase in program authorization October 2019 (d)    
-
     $
-
      
-
     $
3,301
  
Quarter ended October 31, 2019 (a)
    
206,050
     $
0.46
      
206,050
     $
3,206
  
Quarter ended January 31, 2020 (a)
    
267,468
     $
0.70
      
267,468
     $
3,019
  
Quarter ended April 30, 2020 (a)
    
25
     $
0.41
      
25
     $
3,019
  
Total
    
2,721,415
     $
0.36
      
2,721,415