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Note 7 - Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
   
Rental
Commitments
 
2019
  $
57,547
 
2020
   
116,464
 
2021
   
118,519
 
2022
   
39,735
 
Total
   
332,265
 
Less: imputed interest
   
(40,416
)
    $
291,849
 
   
Rental
Commitments
 
2019
  $
114,409
 
2020
   
116,464
 
2021
   
118,519
 
2022
   
39,735
 
    $
389,127