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Note 9 - Stock Warrants (Tables)
 9 Months Ended
Sep. 30, 2019
Disclosure Text Block Supplement [Abstract]  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
A summary of warrants issued, exercised and expired are as follows:

   

Shares

    

Weighted- Average

Exercise Price ($)

    

Weighted- Average

Remaining

Contractual Term

  

Outstanding at December 31, 2017

     142,653     $ 17.42       1.00  

Granted

     1,025,000       0.10       4.93  

Expired

     -       -       -  
                         

Outstanding at December 31, 2018

     1,167,653     $ 2.18       4.36  
                         

Granted

     400,000       0.10       4.50  

Expired

     (142,653

)

     17.42       -  

Outstanding at September 30, 2019

     1,425,000     $ 0.10       4.50  
                         

Exercisable at September 30, 2019

     1,425,000     $ 0.10       4.25