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Note 9 - Share-based Compensation (Tables)
6 Months Ended
Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
   

Number of

Shares

   

Weighted Average

Exercise Price

 

Outstanding October 1, 2013

    2,394,476     $ 1.89  

Granted

    782,500     $ 1.77  

Forfeited/expired

    (10,458 )   $ 1.93  

Exercised

    (357,476 )   $ 0.54  

Outstanding March 31, 2014

    2,809,042     $ 2.02  

Exercisable March 31, 2014

    2,087,673     $ 2.09  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   

Three months ended

March 31,

   

Six months ended

March 31,

 
   

2014

   

2013

   

2014

   

2013

 

Cost of revenue

  $ 4,409     $ 1,306     $ 6,467     $ 5,205  

Selling, general and administrative

    163,385       171,044       294,561       360,875  

Research and development

    23,814       11,975       40,394       24,223  

Total

  $ 191,608     $ 184,325     $ 341,422     $ 390,303  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   

Six months ended

March 31,

   

2014

 

2013

Volatility

 

54.0% - 76.0%

 

81.0%

Risk-free interest rate

 

0.6%-2.0%

 

0.9%

Forfeiture rate

 

10.0%

 

10.0%

Dividend yield

 

0.0%

 

0.0%

Expected life in years

 

3.2 - 6.5

 

6.4