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Note 5 - Share Based Compensation (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Three Months Ended March 31,
 
   
201
8
   
201
7
 
                 
                 
Selling, general and administrative
  $
471,146
    $
112,856
 
Research, development and engineering
   
78,787
     
48,233
 
    $
549,933
    $
161,089