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Note 4 - Share Based Compensation (Tables)
9 Months Ended
Sep. 30, 2017
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
7
   
201
6
 
                 
Selling, general and administrative
  $
207,047
    $
31,610
 
Research, development and engineering
   
21,663
     
25,074
 
    $
228,710
    $
56,684
 
   
Nine Months
Ended
September 30,
   
Nine Months
Ended
September 30,
 
   
201
7
   
201
6
 
                 
Selling, general and administrative
  $
714,167
    $
221,791
 
Research, development and engineering
   
88,826
     
59,191
 
    $
802,993
    $
280,982