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Note 11 - Stock-based Compensation (Tables)
 12 Months Ended
Aug. 31, 2017
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    August 31, 2017   August 31, 2016
Dividend yield    
0.00
 %    
0.00
 %
Expected volatility    
46.0
 %    
46.6
 %
Expected life of option (years)    
10
      
10
  
Weighted average risk-free interest rate    
1.63
 %    
1.63
 %
Share-based Compensation, Stock Options, Activity [Table Text Block]
    Number of
Shares (#)		   Weighted Average Exercise Price   Aggregate
Intrinsic Value
Outstanding at August 31, 2015    
241,734
     $
13.72
      
 
  
Options granted    
53,447
      
14.85
      
 
  
Options exercised    
0
      
0.00
      
 
  
Options terminated    
(12,000
 )    
13.38
      
 
  
                         
Outstanding at August 31, 2016    
283,181
      
13.95
      
 
  
Options granted    
56,677
      
13.40
      
 
  
Options exercised    
(12,000
 )    
10.25
      
 
  
Options terminated    
(20,000
 )    
15.21
      
 
  
                         
Outstanding at August 31, 2017    
307,858
     $
13.93
     $
1,238,009
  
                         
Exercisable at August 31, 2017    
221,027
     $
13.76
     $
942,314