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Note 9 - Stockholders' Equity (Tables)
 12 Months Ended
Aug. 31, 2013
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, 2011
    189,839     $ 9.07        
Options granted
    26,000       16.45        
Options exercised
    (3,966 )     8.71        
Options terminated
    (8,000 )     9.23        
                       
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     $ 1,358,325  
                         
Exercisable at August 31, 2013
    134,998     $ 9.48     $ 768,043  
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
   
  25,140       $ 9.95    
  4,000         12.84    
  4,000         8.57    
  1,734         7.65    
  1,500         9.76    
  666         7.75    
Options
Exercised
   
Exercise
Price
   
  1,966       $ 7.65    
  2,000         9.75