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Note 9 - Stock Repurchase Program (Tables)
 3 Months Ended
Jul. 31, 2018
Notes Tables  
Class of Treasury Stock [Table Text Block]
Period
  
Total
Number of
Shares
Purchased
(a)
    
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
  
Total
    
878,814
     $
0.26
      
878,814