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Note 4 - Stock-based Compensation (Tables)
 9 Months Ended
Jun. 30, 2017
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
    Number of
options		   Weighted average
exercise price
Outstanding at September 30, 2016    
54,800
     $
3.13
  
   Granted    
-
      
-
  
   Exercised    
(15,850
 )    
3.97
  
   Cancelled or Forfeited    
-
      
-
  
Outstanding at June 30, 2017    
38,950
     $
2.79
  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
    Number of
shares		   Weighted average grant
date fair value
Unvested shares at September 30, 2016    
563,570
     $
14.26
  
   Granted    
3,795
      
16.45
  
   Vested    
(88,814
 )    
17.36
  
   Forfeited    
(7,952
 )    
15.05
  
Unvested at June 30, 2017    
470,599
     $
13.68