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Note 9 - Commitments (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
         
2018
  $
1,478
 
2019
   
-
 
         
Minimum Guarantee Payments Under Renewable License Commitments [Table Text Block]
         
2018
  $
31,418
 
2019
   
30,585
 
2020
   
3,000