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Note 8 - Stock Repurchase Program (Tables)
 9 Months Ended
Jan. 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
    
 
      
 
      
 
     $
500
  
Quarter ended January 31, 2017 (a)
    
49,920
     $
0.20
      
49,920
     $
490
  
Quarter ended April 30, 2017
    
80,426
     $
0.27
      
80,426
     $
468
  
Quarter ended July 31, 2017
    
-
     $
-
      
-
     $
468
  
Quarter ended October 31, 2017
    
8,607
     $
0.30
      
8,607
     $
465
  
Quarter ended January 31, 2018 (b)
    
536,058
     $
0.26
      
536,058
     $
326
  
Total
    
675,011
     $
0.26
      
675,011