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Note 5 - Share Based Compensation (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Three Months Ended June 30,
 
   
201
8
   
201
7
 
                 
Selling, general and administrative
  $
128,620
    $
394,264
 
Research, development and engineering
   
20,922
     
18,930
 
    $
149,542
    $
413,194
 
   
Six Months Ended June 30,
 
   
201
8
   
201
7
 
                 
Selling, general and administrative
  $
599,766
    $
507,120
 
Research, development and engineering
   
99,709
     
67,163
 
    $
699,475
    $
574,283