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Note 3 - Share Based Compensation (Tables)
3 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   

Three Months Ended March 31,

 
   

2015

   

2014

 
                 
                 

Selling, general and administrative

  $ 133,459     $ 74,841  

Research, development and engineering

    28,760       10,932  
    $ 162,219     $ 85,773