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Note 8 - Stock Repurchase Program (Tables)
 3 Months Ended
Jul. 31, 2017
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 
 
 
 
 
 
$
0.00
 
 
 
 
 
 
$
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
 
 
0
 
 
$
0.00
 
 
 
0
 
 
$
468
 
Total
 
 
130,346
 
 
$
0.25
 
 
 
130,346