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Note 10 - Stock-based Compensation (Tables)
 12 Months Ended
Aug. 31, 2018
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    August 31, 2018   August 31, 2017
Dividend yield  
2.18%
  
0.00%
Expected volatility  
45.9%
  
46.0%
Expected life of option (years)  
10
  
10
Weighted average risk-free interest rate  
1.87%
  
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, 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
      
 
  
Options granted    
47,252
      
18.35
      
 
  
Options exercised    
(6,407
 )    
11.59
      
 
  
Options terminated    
—
      
—
      
 
  
                         
Outstanding at August 31, 2018    
348,703
     $
14.57
     $
7,737,763
  
                         
Exercisable at August 31, 2018    
267,850
     $
13.97
     $
6,007,547