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Note 4 - Share Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
 
 
Three Months Ended June 30,
 
 
 
2017
 
 
2016
 
                 
Selling, general and administrative
   $
394,264
     $
44,303
  
Research, development and engineering
    
18,930
      
5,632
  
    $
413,194
     $
49,935
  
 
 
Six Months Ended June
30,
 
 
 
2017
 
 
2016
 
                 
Selling, general and administrative
   $
507,120
     $
190,181
  
Research, development and engineering
    
67,163
      
34,117
  
    $
574,283
     $
224,298