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Note 7 - Commitments (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
2019
  $
138,977
 
2020
   
141,976
 
2021
   
144,976
 
2022
   
110,857
 
         
    $
536,786