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Note 7 - Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
   
Rental
Commitments
 
2018
  $
56,519
 
2019
   
114,409
 
2020
   
116,464
 
2021
   
118,519
 
2022
   
39,735
 
Total
  $
445,646