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Note 8 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
   
Rental Commitments
 
2019
  $
114,409
 
2020
   
116,464
 
2021
   
118,519
 
2022
   
39,735
 
Total
  $
389,127