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Note 2 - Net Income Per Share (Tables)
9 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Three Months Ended June 30,   Nine Months Ended June 30,
    2017   2016   2017   2016
Net income   $
803,316
    $
2,362,061
    $
2,587,767
    $
5,342,494
 
Weighted average common shares    
13,522,755
     
13,397,509
     
13,559,704
     
13,331,632
 
Dilutive potential common shares    
75,827
     
409,419
     
171,241
     
322,844
 
Weighted average dilutive common shares outstanding    
13,598,582
     
13,806,928
     
13,730,945
     
13,654,476
 
Net income per common share:                                
    Basic   $
0.06
    $
0.18
    $
0.19
    $
0.40
 
    Diluted   $
0.06
    $
0.17
    $
0.19
    $
0.39