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Note 5 - Revenue Recognition (Tables)
3 Months Ended
Sep. 30, 2019
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Three Months Ended
 
   
September 30
 
   
2019
     
2018
 
United States
  $
4,504,275
    $
3,770,884
 
Export
   
906,487
     
2,013,955
 
Net Sales
  $
5,410,762
    $
5,784,839