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Note 10 - Stock Repurchase Program (Tables)
3 Months Ended
Jul. 31, 2019
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
 
Shares purchased in prior periods
   
130,346
    $
0.25
     
130,346
    $
468
 
Quarter ended October 31, 2017
   
8,607
    $
0.30
     
8,607
    $
465
 
Quarter ended January 31, 2018 (a)
   
536,058
    $
0.26
     
536,058
    $
326
 
Quarter ended April 30, 2018 (a)
   
178,526
    $
0.25
     
178,526
    $
281
 
Increase in program authorization April 2018 (b)
   
-
    $
-
     
-
    $
531
 
Quarter ended July 31, 2018 (a)
   
25,277
    $
0.26
     
25,277
    $
525
 
Quarter ended October 31, 2018 (a)
   
480,805
    $
0.30
     
480,805
    $
381
 
Quarter ended January 31, 2019 (a)
   
186,727
    $
0.34
     
186,727
    $
317
 
Quarter ended April 30, 2019 (a)
   
580,705
    $
0.38
     
580,705
    $
94
 
Increase in program authorization April 2019 (c)
   
-
    $
-
     
-
    $
1,569
 
Quarter ended July 31, 2019 (a)
   
120,821
    $
0.35
     
120,821
    $
1,526
 
Total
   
2,247,872
    $
0.31
     
2,247,872