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Note 5 - Share Based Compensation (Tables)
9 Months Ended
Sep. 30, 2018
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,
 
   
201
8
   
201
7
 
                 
Selling, general and administrative
  $
170,758
    $
207,047
 
Research, development and engineering
   
25,588
     
21,663
 
    $
196,346
    $
228,710
 
   
Nine Months
Ended
September 30,
   
Nine Months
Ended
September 30,
 
   
201
8
   
201
7
 
                 
Selling, general and administrative
  $
770,524
    $
714,167
 
Research, development and engineering
   
125,297
     
88,826
 
    $
895,821
    $
802,993