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Note 3 - Share Based Compensation (Tables)
9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
 
 
Three
Months
Ended
September 30,
 
 
Three Months
Ended
September 30,
 
 
 
2016
 
 
2015
 
                 
Selling, general and administrative
  $ 31,610     $ 30,779  
Research, development and engineering
    25,074       5,271  
    $ 56,684     $ 36,050  
 
 
Nine Months
Ended
September 30,
 
 
Nine Months
Ended
September 30,
 
 
 
2016
 
 
2015
 
                 
Selling, general and administrative
  $ 221,791     $ 218,653  
Research, development and engineering
    59,191       39,644  
    $ 280,982     $ 258,297