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Note 10 - Stockholders' Equity (Tables)
 12 Months Ended
Aug. 31, 2015
Exercised [Member]  
Notes Tables  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
Options
Exercised		   Exercise
Price
  18,000     $ 9.76  
  18,000       7.65  
  2,333       10.20  
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  
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 exercised     (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          
Options granted     45,067       20.10          
Options exercised     (38,333 )     9.00          
Options terminated     (4,000 )     10.20          
                         
Outstanding at August 31, 2015     241,734     $ 13.72     $ 677,475  
                         
Exercisable at August 31, 2015     160,453     $ 12.13     $ 577,528