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Note 9 - Stock Repurchase Program (Tables)
 6 Months Ended
Oct. 31, 2018
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
    
 
      
 
      
 
     $
750
  
Quarter ended January 31, 2017 (a)
    
49,920
     $
0.20
      
49,920
     $
740
  
Quarter ended April 30, 2017
    
80,426
     $
0.27
      
80,426
     $
718
  
Quarter ended July 31, 2017
    
-
     $
-
      
-
     $
718
  
Quarter ended October 31, 2017
    
8,607
     $
0.30
      
8,607
     $
715
  
Quarter ended January 31, 2018 (a)
    
536,058
     $
0.26
      
536,058
     $
576
  
Quarter ended April 30, 2018 (a)
    
178,526
     $
0.25
      
178,526
     $
531
  
Quarter ended July 31, 2018 (a)
    
25,277
     $
0.26
      
25,277
     $
525
  
Quarter ended October 31, 2018 (a)
    
480,855
     $
0.30
      
480,855
     $
381
  
Total
    
1,359,669
     $
0.27
      
1,359,669