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Note 3 - Share Based Compensation (Tables)
3 Months Ended
Mar. 31, 2016
Notes Tables  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
 
 
Three Months Ended March 31,
 
 
 
2016
 
 
2015
 
                 
                 
Selling, general and administrative
  $ 145,878     $ 133,459  
Research, development and engineering
    28,485       28,760  
    $ 174,363     $ 162,219