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Note 5 - Share Based Compensation (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
   
Three Months Ended March 31,
 
   
201
9
   
201
8
 
                 
                 
Selling, general and administrative
  $
453,086
    $
471,146
 
Research, development and engineering
   
72,947
     
78,787
 
    $
526,033
    $
549,933