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Note 6 - Stock Repurchase Program (Tables)
 12 Months Ended
Apr. 30, 2017
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
  
December 2016    
0
     $
0.00
      
0
     $
500
  
January 2017
    
49,920
     $
0.20
      
49,920
     $
490
  
April 2017
    
80,426
     $
0.27
      
80,426
     $
468
  
Total
    
130,346
     $
0.25
      
130,346