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Note 9 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
   
Rental
Commitments
 
2018
  $
112,354
 
2019
   
114,409
 
2020
   
116,464
 
2021
   
118,519
 
2022
   
39,735
 
Total
  $
501,481