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Note 6 - Prepaid Expenses and Other Receivables (Tables)
9 Months Ended
Sep. 30, 2019
Other Income and Expenses [Abstract]  
Schedule of Other Current Assets [Table Text Block]
Prepaid expenses and other receivables consisted of the following at September 30, 2019 and December 31, 2018:

   

September 30,

2019

   

December 31,

2018

 
                 

Prepaid expenses

  $ 234,260     $ 96,197  

Other receivables

    146,453       9,615  

Total

  $ 380,713     $ 105,812