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Note 9 - Stockholders' Equity (Tables)
 12 Months Ended
Aug. 31, 2014
Note 9 - Stockholders' Equity (Tables) [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Number of
Shares (#)
   
Weighted Average
Exercise Price
   
Aggregate
Intrinsic Value
 
Outstanding at August 31, 2012
    203,873     $ 10.01        
Options granted
    118,294       10.25          
Options exercised
    (37,040 )     9.96          
Options terminated
    (24,500 )     13.12          
                         
Outstanding at August 31, 2013
    260,627     $ 9.84          
Options granted
    56,373       14.83          
Options exercised
    (74,000 )     7.82          
Options terminated
    (4,000 )     8.57          
                         
Outstanding at August 31, 2014
    239,000     $ 11.66     $ 2,163,147  
                         
Exercisable at August 31, 2014
    136,731     $ 10.83     $ 1,351,499  
Stock Option Exercises [Member]
  
Note 9 - Stockholders' Equity (Tables) [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
Options
Exercised
 
Exercise
Price
   
  60,000     $ 7.65    
  14,000       8.57    
Options
Exercised
 
Exercise
Price
   
  25,140     $ 9.95    
  4,000       12.84    
  4,000       8.57    
  1,734       7.65    
  1,500       9.76    
  666       7.75