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Note 14 - Stockholders' Equity (Tables)
 9 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Stockholders Equity [Table Text Block]
   
 
 
 
  
 
 
 
  
Additional
    
 
 
 
  
Other
    
Total
  
   
Common Stock
    
Paid-in
    
Accumulated
   
Comprehensive
    
Stockholders'
  
   
Shares
    
Amount
    
Capital
    
Deficit
    
Loss
    
Equity
  
Balance at September 30, 2017
    
32,158,436
     $
322
     $
87,956,839
     $
(52,771,853
 )   $
(1,269
 )   $
35,184,039
  
Share-based compensation expense
    
-
      
-
      
433,063
      
-
      
-
      
433,063
  
Issuance of common stock upon exercise of stock options, net
    
579,653
      
-
      
1,027,719
      
-
      
-
      
1,027,719
  
Issuance of common stock upon vesting of restricted stock units
    
125,000
      
-
      
-
      
-
      
-
      
-
  
Stock buyback
    
(211,326
 )    
3
      
(500,272
 )    
-
      
-
      
(500,269
 )
Other comprehensive loss
    
-
      
 
      
 
      
 
      
(223,939
 )    
(223,939
 )
Net loss
    
-
      
-
      
-
      
(1,302,564
 )    
-
      
(1,302,564
 )
Balance at June 30, 2018
    
32,651,763
     $
325
     $
88,917,349
     $
(54,074,417
 )   $
(225,208
 )   $
34,618,049