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Note 10 - Share-based Compensation (Tables)
 3 Months Ended
Dec. 31, 2017
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Number
   
Weighted Average
  
   
of Shares
   
Exercise Price
  
Outstanding October 1, 2017
    
4,663,502
     $
2.16
  
Granted
    
3,500
     $
2.21
  
Forfeited/expired
    
(80,833
 )   $
2.84
  
Exercised
    
(90,852
 )   $
1.76
  
Outstanding December 31, 2017
    
4,495,317
     $
2.15
  
Exercisable December 31, 2017
    
3,251,811
     $
2.24
  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Three months ended
  
   
December 31,
  
   
2017
    
2016
  
Cost of revenues
   $
6,209
     $
5,877
  
Selling, general and administrative
    
109,322
      
435,497
  
Research and development
    
22,930
      
23,375
  
Total
   $
138,461
     $
464,749
  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
Three months ended
  
   
December 31,
  
   
2017
    
2016
  
Volatility
    
45.4%
    
 52.4%
-
53.7%
  
Risk-free interest rate
    
2.2%
    
 1.7%
-
2.0%
  
Forfeiture rate
    
10.0%
    
 
10.
0%
 
  
Dividend yield
    
0.0%
    
 
0.
0%
 
  
Expected life in years
    
4.6
    
 3.8
-
4.6